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Topic - Car help - why is my parking brake efficiency so low?

Ben Sharp - on 10 Jul 2013
I just got my car back from it's MOT and it needs a few things, one of the things it failed on was having a rear park brake efficiency of 8%. Which I thought was pretty low?

I parked the car on a really steep hill last night and the hand brake held it fine (like a really steep hill. I was wondering how the score can be so low yet the handbrake seems to do the job in practice. I always thought if it held it on a hill then it would pass the MOT...guess not. So how do they test it?

Also I've been lazy in the past and just tightened the cable from under the handbrake gaitor before, is this a bad idea? I'm guessing if that would have passed it then they'd have done that instead of suggesting taking the drums apart. Is it possible that I've stretched the cable to the point where it is that that's causing the problem?

Cheers

Ben
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