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Adjust Parking Brake - AR42.20-P-0540SR

MODEL 453 

MODIFICATION NOTES

07.10.2016 Adjusting nut (3) must always be replaced. See SI42.20-P-0004A
12.01.2016 Document revised completely.    
G12096930Courtesy of MERCEDES-BENZ USA
  Adjust     
1 Unclip cover (2)    
2 Remove adjusting nut (3) and screw new nut onto thread. Lower parking brake lever (1) fully    
REFER TO DESCRIPTION & OPERATION     SI42.20-P-0004A
    IMPORTANT Nut must always be replaced.  
    IMPORTANT The thread must fit flush with the nut (3).  
3 Check condition of brake system on rear axle, reset brake shoes and position again using the adjustment IMPORTANT Lower vehicle far enough so that the wheels can still turn. AR42.10-P-1010SR 
4 Adjust free travel on parking brake lever using nut (3) IMPORTANT A noticeable free travel of approx. 2 to 3 mm must be given, before the brake cables can be tightened.  
5 Turn wheels on rear axle IMPORTANT The wheels must turn freely.
If brake shoes are making contact

Check brake cables for unobstructed movement and adjust free travel again
AR42.20-P-0545SR 
6 Tighten parking brake lever (1) up to third notch    
7 Turn wheels on rear axle IMPORTANT The wheels must turn with a noticeable braking effect.
If there is hardly any or no noticeable braking effect

Tighten parking brake lever (1) up to fourth notch and turn wheels again
 
8 Correct adjustment of nut (3) on thread, taking free travel into consideration If the braking effect is still hardly or not perceptible at all in the fourth notch.  
9 Tighten parking brake lever (1) up to fifth notch    
10 Turn wheels on rear axle IMPORTANT It should no longer be possible to turn the wheels.
If the wheels still turn.

Tighten parking brake lever (1) up to seventh notch and turn wheels again
 
11 Correct adjustment of nut (3) on thread, taking free travel into consideration If the wheels still turn, even in the seventh notch.  
12 Tighten parking brake lever (1) then release it again, several times in succession    
13 Check the parking brake adjustment If adjustment changed

Correct adjustment of nut (3) on thread, taking free travel into consideration
 
14 Lower vehicle with vehicle lift    
15 Clip in cover (2)    
INSPECT Check     
16 REFER TO MAINTENANCE Carry out brake test on the test stand   AP42.00-P-4290MCC