Parking brake - Revision history

Masood at 22:26, 4 January 2022

2022-01-04T22:26:14Z

← Older revision		Revision as of 22:26, 4 January 2022
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	\|}		\|}
	[[File:W220_rear_brake_shoes_replaced.jpg\|thumb\|none\|]]		[[File:W220_rear_brake_shoes_replaced.jpg\|thumb\|none\|]]

			== Parking/Emergency Brake Pedal Not Sticking ==

			This is a simple fix where the latch or hook comes off loose. Instead of a costly bill to replace the entire brake assembly, simply just move the latch back to its place. This procedure applies to many Mercedes Benz models and is not limited to the W220.

			{\|
			\|{{#ev:youtube\|https://youtu.be/-HJOIEUbzKQ\|320\|left\|Mercedes W220 Parking Brake Pedal Not Sticking By Masood\|frame}}
			\|}

Pokseva: /* Remove/install brake shoes of parking brake */

2021-07-28T16:17:56Z

Remove/install brake shoes of parking brake

← Older revision		Revision as of 16:17, 28 July 2021
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	MODEL 230		MODEL 230
	MODEL 230.479 with CODE (P99) Special model "AMG Black Series" -->		MODEL 230.479 with CODE (P99) Special model "AMG Black Series" -->

			For parts see [[brakes]] page.

	{\|		{\|

Pokseva: /* part numbers */ photo from epc

2021-06-27T10:31:24Z

part numbers: photo from epc

← Older revision		Revision as of 10:31, 27 June 2021
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	The indicator lamp in the instrument cluster goes out.		The indicator lamp in the instrument cluster goes out.

			== Part numbers ==

			[[File:W220_foot_operated_parking_bake_epc.png\|thumb\|none\|Parking brake-related parts in [[EPC]]]]


	== Friction brake pedal assembly / parking brake ==		== Friction brake pedal assembly / parking brake ==

Pokseva: /* Remove/install brake shoes of parking brake */ added photo with replaced brake shoes

2019-11-16T17:23:02Z

Remove/install brake shoes of parking brake: added photo with replaced brake shoes

← Older revision		Revision as of 17:23, 16 November 2019
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	\|[[File:W220_Remove_the_Parking_Brake_Cable.JPG\|thumb\|none]]		\|[[File:W220_Remove_the_Parking_Brake_Cable.JPG\|thumb\|none]]
	\|}		\|}
			[[File:W220_rear_brake_shoes_replaced.jpg\|thumb\|none\|]]

Pokseva: /* Adjusting parking brake */ seized expansion locks

2019-11-16T17:12:56Z

Adjusting parking brake: seized expansion locks

← Older revision		Revision as of 17:12, 16 November 2019
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	{\|		{\|
	\|{{#ev:youtube\|https://www.youtube.com/watch?v=o5aH0iRlKHI\|320\|left\|Parking brake automatic cable slack adjustment.\|frame}}		\|{{#ev:youtube\|https://www.youtube.com/watch?v=o5aH0iRlKHI\|320\|left\|Parking brake automatic cable slack adjustment.\|frame}}
			\|}


			If after the adjustment the hand brake is still very weak, make sure that the expansion locks on both sides are not rusted and seized (see below). If they do not move freely, they should be cleaned and greased.

			{\|
			\|[[File:W220_rear_brake_shoes_expansion_lock_seized_installed.jpg\|thumb\|none\|Seized expansion lock]]
			\|[[File:W220_rear_brake_shoes_expansion_lock_seized_removed.jpg\|thumb\|none\|Seized expansion lock removed]]
			\|[[File:W220_rear_brake_shoes_expansion_lock_seized_moving.jpg\|thumb\|none\|Seized expansion lock broken free]]
	\|}		\|}

Pokseva: /* Pre-tension automatic cable slack adjuster */ off-car suggestion

2019-11-15T21:43:48Z

Pre-tension automatic cable slack adjuster: off-car suggestion

← Older revision		Revision as of 21:43, 15 November 2019
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	engages with the raised section (h) in the holddown clip (d).		engages with the raised section (h) in the holddown clip (d).

	''Pretensioning spring-loaded slack adjuster releases any tension in the parking brake cables and the cables may even be taken off the tensioning mechanism if required. It can take a while to succeed. The trick is to rotate the detent eccentric bolt (g) counter clockwise (when viewed from underneath) and simultaneously push backwards to rear of vehicle (don't push it fully otherwise it will block against the other side and will not rotate) until it clicks into place into the hold down clip spring (d). It takes full turn to rotate fully relieved adjuster to pretensioned state. ~~If the hexagonal socket (g) is badly worn, it~~ may be easier to remove the adjuster off the vehicle (remove 11mm bolt holding cable ~~which~~ goes to brake pedal~~) and pretension it by moving spring-loaded detent eccentric (b) in the correct position by hands~~.''		''Pretensioning spring-loaded slack adjuster releases any tension in the parking brake cables and the cables may even be taken off the tensioning mechanism if required. It can take a while to succeed. The trick is to rotate the detent eccentric bolt (g) counter clockwise (when viewed from underneath) and simultaneously push backwards to rear of vehicle (don't push it fully otherwise it will block against the other side and will not rotate) until it clicks into place into the hold down clip spring (d). It takes full turn to rotate fully relieved adjuster to pretensioned state.

			'''Note: It may be much faster and easier to remove the adjuster off the vehicle, pretension it by hands and put back on. To remove the adjuster, remove 11mm bolt holding the cable that goes to the brake pedal.'''

	==== Relieve load on automatic slack adjuster ====		==== Relieve load on automatic slack adjuster ====

Pokseva at 15:21, 4 October 2018

2018-10-04T15:21:46Z

← Older revision		Revision as of 15:21, 4 October 2018
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	\|}		\|}

	~~==Replacing Parking Brake==~~		Alternative instruction:
	#Unload Parking Brake Automatic Cable Slack Adjuster See below.		#Unload Parking Brake Automatic Cable Slack Adjuster See below.
	#Take off the rear wheel, observe how freely the rotor turns while turning it by hand.		#Take off the rear wheel, observe how freely the rotor turns while turning it by hand.
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	#Rotate the parking brake thumbwheel (ratchet mechanism) downwards (screw driver handle upwards) to release the brake to its maximum clearance.		#Rotate the parking brake thumbwheel (ratchet mechanism) downwards (screw driver handle upwards) to release the brake to its maximum clearance.
	#Remove the Torx screw holding brake disk to rear axle shaft flange.		#Remove the Torx screw holding brake disk to rear axle shaft flange.
	~~#:[[File:W220_Remove_Rear_Brake_Disk.JPG\|300px\|center]]~~
	#Remove the Brake Disk to gain access to the parking brake mechanisms. '''TIP''': If you haven’t previously used anti-seize grease on the hub you may have to tap the disc with a rubber mallet.		#Remove the Brake Disk to gain access to the parking brake mechanisms. '''TIP''': If you haven’t previously used anti-seize grease on the hub you may have to tap the disc with a rubber mallet.
	~~#:[[File:W220_tap_the_disc_with_a_rubber_mallet.JPG\|300px\|center]]~~
	#Remove the Parking Brake Lower Retracting Spring. This requires a fair bit of effort but it is possible with normal 45º long nose pliers.		#Remove the Parking Brake Lower Retracting Spring. This requires a fair bit of effort but it is possible with normal 45º long nose pliers.
	~~#:[[File:W220_Remove_the_Parking_Brake_Lower_Retracting_Spring.JPG\|300px\|center]]~~
	#Remove the Brake Shoe Retaining Springs. Remove the two rear brake shoe retaining springs by pushing them inwards and twisting 90º.		#Remove the Brake Shoe Retaining Springs. Remove the two rear brake shoe retaining springs by pushing them inwards and twisting 90º.
	~~#:[[File:W220_Remove_the_Brake_Shoe_Retaining_Springs.JPG\|300px\|center]]~~
	#Note the Retaining Springs Alignment for Re-installation. '''TIP''': The installed position of the retaining springs is such that the hook end is facing radially inwards and pointing directly at the centre of the wheel hub.		#Note the Retaining Springs Alignment for Re-installation. '''TIP''': The installed position of the retaining springs is such that the hook end is facing radially inwards and pointing directly at the centre of the wheel hub.
	~~#:[[File:W220_Retaining_Springs_Alignment.JPG\|300px\|center]]~~
	#Remove the Parking Brake Shoes and Adjusting Mechanism over the Wheel Hub.		#Remove the Parking Brake Shoes and Adjusting Mechanism over the Wheel Hub.
	~~#:[[File: W220_Parking_Brake_Shoes_and_Adjusting_Mechanism.JPG\|300px\|center]]~~
	#Note the Orientation of the Parking Brake Adjusting Thumbwheel. '''TIP''': The thrust piece (shorter length) is towards the front of the vehicle on both sides. The next Figure shows the right side wheel.		#Note the Orientation of the Parking Brake Adjusting Thumbwheel. '''TIP''': The thrust piece (shorter length) is towards the front of the vehicle on both sides. The next Figure shows the right side wheel.
	~~#:[[File:W220_Orientation_of_the_RH_Parking_Brake_Adjusting_Thumbwheel.JPG\|300px\|center]]~~
	#:The diagram in WIS shows the left side wheel with the thrust piece (c) (shorter length) on the left facing towards the front of the vehicle.		#:The diagram in WIS shows the left side wheel with the thrust piece (c) (shorter length) on the left facing towards the front of the vehicle.
	~~#:[[File:W220_Orientation_of_the_LH_Parking_Brake_Adjusting_Thumbwheel.JPG\|500px\|center]]~~
	#Store the Parking Brake. '''TIP''': Store the parking brake out of the way maintaining the correct positioning for each component to aid in re-installation.		#Store the Parking Brake. '''TIP''': Store the parking brake out of the way maintaining the correct positioning for each component to aid in re-installation.
	#Remove the Parking Brake Expansion Lock. '''TIP''': Carefully remove the parking brake expansion lock (actuating mechanism) and note the orientation. The hooked end of the Expansion Lock (109) is towards the front of the vehicle on both sides. The next Figure shows the right side wheel.		#Remove the Parking Brake Expansion Lock. '''TIP''': Carefully remove the parking brake expansion lock (actuating mechanism) and note the orientation. The hooked end of the Expansion Lock (109) is towards the front of the vehicle on both sides. The next Figure shows the right side wheel.
	~~#:[[File:W220_RH_Parking_Brake_Expansion_Lock.JPG\|300px\|center]]~~
	#: WIS shows the left side wheel.		#: WIS shows the left side wheel.
	~~#:[[File:W220_Orientation_of_the_LH_Parking_Brake_Adjusting_Thumbwheel.JPG\|500px\|center]]~~
	#Remove the Parking Brake Cable. '''TIP''': Remove the bolt and withdraw the parking brake cable and place out of the way.		#Remove the Parking Brake Cable. '''TIP''': Remove the bolt and withdraw the parking brake cable and place out of the way.
	~~#:[[File:W220_Remove_the_Parking_Brake_Cable.JPG\|300px\|center]]~~
	#Reinstall in reverse order remembering to Preload Brake Automatic Cable Slack Adjuster. See below.		#Reinstall in reverse order remembering to Preload Brake Automatic Cable Slack Adjuster. See below.

			{\|
			\|[[File:W220_Remove_Rear_Brake_Disk.JPG\|thumb\|none]]
			\|[[File:W220_tap_the_disc_with_a_rubber_mallet.JPG\|thumb\|none]]
			\|[[File:W220_Remove_the_Parking_Brake_Lower_Retracting_Spring.JPG\|thumb\|none]]
			\|}

			{\|
			\|[[File:W220_Remove_the_Brake_Shoe_Retaining_Springs.JPG\|thumb\|none]]
			\|[[File:W220_Retaining_Springs_Alignment.JPG\|thumb\|none]]
			\|[[File:W220_Orientation_of_the_RH_Parking_Brake_Adjusting_Thumbwheel.JPG\|thumb\|none]]
			\|}
			{\|
			\|[[File: W220_Parking_Brake_Shoes_and_Adjusting_Mechanism.JPG\|thumb\|none]]
			\|[[File:W220_RH_Parking_Brake_Expansion_Lock.JPG\|thumb\|none]]
			\|[[File:W220_Remove_the_Parking_Brake_Cable.JPG\|thumb\|none]]
			\|}

Pokseva: /* Adjusting parking brake */

2018-10-04T15:00:50Z

Adjusting parking brake

← Older revision		Revision as of 15:00, 4 October 2018
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	# Lift vehicle with lifting platform until the wheels are clear		# Lift vehicle with lifting platform until the wheels are clear
	# Pre-tension automatic cable slack adjuster		# Pre-tension automatic cable slack adjuster
	# Remove rear wheels.		# Remove rear wheels. ''For reference, observe how freely the rotor turns while turning it by hand.''
	# Using a suitable tool, turn the adjusting wheel (105) until the brake shoes touch the brake drum and the rear wheel no longer turns. Adjustment direction for applying the brake shoes~~: Right side: Turn~~ the adjusting wheel (105) from the bottom upwards. ~~Left side: Turn~~ the ~~adjusting wheel~~ (~~105~~) ~~from the bottom upwards~~.		# ''Rotate the right side wheel so that the access hole (any wheel bolt hole) is positioned at 11:00 o’clock position to provide access to the parking brake thumbwheel (ratchet mechanism). For the left side wheel the access hole (wheel bolt hole) is positioned at the 1:00 o’clock position.''
			# ''Shine a flashlight into the hole (or use a video inspection camera) to see what the tooth of the thumbwheel inside looks like.''
			# Using a suitable tool ''(flat blade screwdriver)'', turn the adjusting wheel (105) until the brake shoes touch the brake drum and the rear wheel no longer turns. ''(Do about two turns and turn the rotor to see if there is a slight resistance turning the rotors.)'' Adjustment direction for applying the brake shoes turn the adjusting wheel (105) from the bottom upwards. ''The adjustment direction depends on the direction the thumbwheel (ratchet mechanism) has been installed.''
	# Turn back the adjusting wheel (105) until the rear wheel can be turned completely freely. When slackening the adjusting wheels ensure that both sides are turned back by the same number of teeth (10 teeth).		# Turn back the adjusting wheel (105) until the rear wheel can be turned completely freely. When slackening the adjusting wheels ensure that both sides are turned back by the same number of teeth (10 teeth).
	# Relieve load on automatic cable slack adjuster.		# Relieve load on automatic cable slack adjuster.

Pokseva: /* Automatic slack adjuster */

2018-10-04T14:52:50Z

Automatic slack adjuster

← Older revision		Revision as of 14:52, 4 October 2018
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	Part no A2204200038 (~55 EUR).		Part no A2204200038 (~55 EUR).
	{\|		{\|
	\|[[File:W220_parking_brake_automatic_slack_adjuster.jpg\|thumb\|none\|Slack adjuster (underneath vehicle ~~view~~)]]		\|[[File:W220_parking_brake_automatic_slack_adjuster.jpg\|thumb\|none\|Slack adjuster pretensioned (underneath vehicle)]]
	\|[[File:W220_parking_brake_adjuster_A2204200038_underneath_view.jpg\|thumb\|none\|Automatic slack adjuster (underneath view)]]		\|[[File:W220_parking_brake_adjuster_A2204200038_underneath_view.jpg\|thumb\|none\|Automatic slack adjuster (underneath view)]]
	\|[[File:W220_parking_brake_adjuster_A2204200038_top_view.jpg\|thumb\|none\|Automatic slack adjuster (top view)]]		\|[[File:W220_parking_brake_adjuster_A2204200038_top_view.jpg\|thumb\|none\|Automatic slack adjuster (top view)]]
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	==== Pre-tension automatic cable slack adjuster ====		==== Pre-tension automatic cable slack adjuster ====
	<!-- AR42.20-P-0520-01A Pre-tension automatic cable slack adjuster -->		<!-- AR42.20-P-0520-01A Pre-tension automatic cable slack adjuster -->
	[[File:W220_pretention_automatic_cable_slack_adjustment.png]]		{\|
			\|[[File:W220_pretention_automatic_cable_slack_adjustment.png\|thumb\|none\|Adjuster almost pretensioned (underneaeth view)]]
			\|[[File:W220_parking_brake_adjuster_pretensioned.jpg\|thumb\|none\|Adjuster pretentsioned (locked by clip)]]
			\|}

	Turn detent eccentric bolt (g) to the left using the Allen wrench (approximately half a turn)		Turn detent eccentric bolt (g) to the left using the Allen wrench (approximately half a turn)
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	engages with the raised section (h) in the holddown clip (d).		engages with the raised section (h) in the holddown clip (d).

	''~~This~~ releases any tension in the parking brake cables and the cables may even be taken off the tensioning mechanism if required. It can take ~~several attempts~~ to ~~get this right~~. The trick is to rotate the detent eccentric bolt (g) counter clockwise when viewed from underneath until it clicks into place into the hold down clip spring (d).''		''Pretensioning spring-loaded slack adjuster releases any tension in the parking brake cables and the cables may even be taken off the tensioning mechanism if required. It can take a while to succeed. The trick is to rotate the detent eccentric bolt (g) counter clockwise (when viewed from underneath) and simultaneously push backwards to rear of vehicle (don't push it fully otherwise it will block against the other side and will not rotate) until it clicks into place into the hold down clip spring (d). It takes full turn to rotate fully relieved adjuster to pretensioned state. If the hexagonal socket (g) is badly worn, it may be easier to remove the adjuster off the vehicle (remove 11mm bolt holding cable which goes to brake pedal) and pretension it by moving spring-loaded detent eccentric (b) in the correct position by hands.''

	==== Relieve load on automatic slack adjuster ====		==== Relieve load on automatic slack adjuster ====
	<!-- AR42.20-P-0520-02A Relieve load on automatic slack adjuster -->		<!-- AR42.20-P-0520-02A Relieve load on automatic slack adjuster -->
	[[File:W220_Relieve_load_on_automatic_slack_adjuster.png]]		{\|
			\|[[File:W220_Relieve_load_on_automatic_slack_adjuster.png\|thumb\|Adjuster pretensioned (top view)]]
			\|[[File:W220_parking_brake_adjuster_fully_relieved.jpg\|thumb\|none\|Adjuster fully relieved (side view)]]
			\|}

	Lift center holddown clip (arrow) using a screwdriver so that the cable slack adjuster sets itself automatically.		Lift center holddown clip (arrow) using a screwdriver so that the cable slack adjuster sets itself automatically.

	''Using a flat bladed screw driver push in the direction of the arrow to release the hold down clip (d) on the brake automatic cable slack adjuster. This tensions both parking brake cables and the cable slack adjuster will set itself automatically.''

	{\|		{\|
	\|{{#ev:youtube\|https://www.youtube.com/watch?v=o5aH0iRlKHI\|320\|left\|Parking brake automatic cable slack adjustment.\|frame}}		\|{{#ev:youtube\|https://www.youtube.com/watch?v=o5aH0iRlKHI\|320\|left\|Parking brake automatic cable slack adjustment.\|frame}}
	\|}		\|}

	~~Alternative instruction:~~
	~~#Release Parking Brake~~
	~~#Pre-tension automatic cable slack adjuster (see above).~~
	~~#Take off the rear wheel, observe how freely the rotor turns while turning it by hand.~~
	#Rotate the right side wheel so that the access hole (any wheel bolt hole) is positioned at 11:00 o’clock position to provide access to the parking brake thumbwheel (ratchet mechanism). (For the left side wheel the access hole (wheel bolt hole) is positioned at the 1:00 o’clock position.
	~~#Shine a flashlight into the hole (or use a video inspection camera) to see what the tooth of the thumbwheel inside looks like.~~
	~~#Insert a flat blade screwdriver through the hole and catch between two teeth.~~
	#Start moving the screwdriver handle upward (tip of the screwdriver moving downward) to turn the adjusting wheel clockwise, do about two turns and turn the rotor to see if there is a slight resistance turning the rotors and adjust more or less depending on the resistance.
	~~#Once the rotor will not turn, backoff the thumbwheel adjustment about five notches until the rotor will turn freely. Both sides should be backed off the same amount.~~
	~~#Finally relieve load on automatic slack adjuster (see above).~~

	== Remove/install brake shoes of parking brake ==		== Remove/install brake shoes of parking brake ==

Pokseva: /* Adjusting parking brake */

2018-10-03T19:31:44Z

Adjusting parking brake

← Older revision		Revision as of 19:31, 3 October 2018
Line 116:		Line 116:
	* Notches through which the parking brake pedal must be depressed: 5 (pedal assembly with pushed detent)		* Notches through which the parking brake pedal must be depressed: 5 (pedal assembly with pushed detent)

	=== Pre-tension automatic cable slack adjuster ===		=== Automatic slack adjuster===
			The parking brake cable automatic tensioning mechanism is located underneath the car.
			Part no A2204200038 (~55 EUR).
			{\|
			\|[[File:W220_parking_brake_automatic_slack_adjuster.jpg\|thumb\|none\|Slack adjuster (underneath vehicle view)]]
			\|[[File:W220_parking_brake_adjuster_A2204200038_underneath_view.jpg\|thumb\|none\|Automatic slack adjuster (underneath view)]]
			\|[[File:W220_parking_brake_adjuster_A2204200038_top_view.jpg\|thumb\|none\|Automatic slack adjuster (top view)]]
			\|}

			==== Pre-tension automatic cable slack adjuster ====
	<!-- AR42.20-P-0520-01A Pre-tension automatic cable slack adjuster -->		<!-- AR42.20-P-0520-01A Pre-tension automatic cable slack adjuster -->
	[[File:W220_pretention_automatic_cable_slack_adjustment.png]]		[[File:W220_pretention_automatic_cable_slack_adjustment.png]]
Line 124:		Line 133:
	engages with the raised section (h) in the holddown clip (d).		engages with the raised section (h) in the holddown clip (d).

	''~~The parking brake cable automatic tensioning mechanism is located underneath the car.~~ This releases any tension in the parking brake cables and the cables may even be taken off the tensioning mechanism if required. ~~'''TIP''':~~ It can take several attempts to get this right. The trick is to rotate the detent eccentric bolt (g) counter clockwise when viewed from underneath until it clicks into place into the hold down clip spring (d).''		''This releases any tension in the parking brake cables and the cables may even be taken off the tensioning mechanism if required. It can take several attempts to get this right. The trick is to rotate the detent eccentric bolt (g) counter clockwise when viewed from underneath until it clicks into place into the hold down clip spring (d).''

	=== Relieve load on automatic slack adjuster ===		==== Relieve load on automatic slack adjuster ====
	<!-- AR42.20-P-0520-02A Relieve load on automatic slack adjuster -->		<!-- AR42.20-P-0520-02A Relieve load on automatic slack adjuster -->
	[[File:W220_Relieve_load_on_automatic_slack_adjuster.png]]		[[File:W220_Relieve_load_on_automatic_slack_adjuster.png]]