SLK/R170: brake vaccum problem[death in the a.m.?]
Thread Starter
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Joined: Aug 2004
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From: ireland
austin-healy sprite,slk black
brake vaccum problem[death in the a.m.?]
hi guys.
each morning while leaving my garage the first press of the brake and the second has a hard pedel. i mean its like a rock, and is a bit scarey.what i do now is press the pedal and hold it ,then i rev the engine the pedel , then the pedal sinks and behaves as normal for the rest of the day.while looking under the bonnet i followed the brake boost vaccum pipe to a small unit mounted in a rubber ;cage; i dont know what the unit is, could this be the cause of the bas/esp light comming on sometimes?
please dont tell me take it to the dealer as mine is a ,well the ,,, lets leave it..
any advise gratefully accepted
fab
each morning while leaving my garage the first press of the brake and the second has a hard pedel. i mean its like a rock, and is a bit scarey.what i do now is press the pedal and hold it ,then i rev the engine the pedel , then the pedal sinks and behaves as normal for the rest of the day.while looking under the bonnet i followed the brake boost vaccum pipe to a small unit mounted in a rubber ;cage; i dont know what the unit is, could this be the cause of the bas/esp light comming on sometimes?
please dont tell me take it to the dealer as mine is a ,well the ,,, lets leave it..
any advise gratefully accepted
fab
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Joined: Jan 2004
Posts: 402
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11 ML350
There is a one way check valve on the hard plastic line going to the brake booster that causes this problem.
I think you'll have to replaced the hole line.
Or just let the car warm up all the way in the morning,
I think you'll have to replaced the hole line.
Or just let the car warm up all the way in the morning,
Thread Starter
Almost a Member!
Joined: Aug 2004
Posts: 26
Likes: 0
From: ireland
austin-healy sprite,slk black
death in the am
thanks so mutch for your reply.it sound right, i am working this weekend so i will check it on monday.i think there is a y junction on the line ,one goes to the inlet manifold, the other to what i think is the lateral acc. senser.there is a one way valve on each line.i will let you know the result.again thanks for your input
fab
fab
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Joined: Apr 2005
Posts: 374
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Normal.
To check brake booster on 99% of cars do this.
Press brake engine not running.
IF it has a little bit of vac left press a couple of times until peddle goes hard.
Continue to hold down and start engine. Pedal should sink a bit and feel softer.
bazzle
To check brake booster on 99% of cars do this.
Press brake engine not running.
IF it has a little bit of vac left press a couple of times until peddle goes hard.
Continue to hold down and start engine. Pedal should sink a bit and feel softer.
bazzle
