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Dead spot at top of brake pedal ...

Z

zcacogp

Active member
Chaps,

I have a dead spot at the top of my brake pedal. It's due to slack in the system.

It seems that (it being a RHD car), the pedal connects to a linkage which runs across the front of the passenger footwell, which connects to a rod in the passenger side, which pushes into the brake master cylinder.

This rod has an adjustable clevis on the end. Presumably, taking this dead spot (play) out is as simple as adjusting this clevis? It's on a thread on the end of the rod, so unscrewing it a bit will take the play out?

I've tried this .... and the clevis is screwed on VERY tightly. Any helpful hints for getting it loose?

Also, what happens if you screw the rod at the other end - i.e. try and screw it in or out of the master cylinder? Is there a thread there that can be used, or does it make no difference?

Failing me getting the clevis undone, is there any other way of adjusting any slack out of the brake system?

Thanks in advance, as usual ...


Oli.
 
Oli, are you sure that it's not just wear and tear... ...in your knees?![:D]

On a more serious and useful note, I'd also check the actual fixing of the pedal to the bulkhead to make sure that there is no movement there - my clutch pedal developed a strange 'off centre' movement, which was down to the nuts coming loose... story of my life![:D]
 
Nick.

Thanks. Both my knees and nuts are in fine shape. [;)]

Or, on a more serious and useful note (!), I am sure it is slack in the mechanism as I have rootled around in the passenger footwell and can see the slack there, from pushing on the pedal (very difficult if you don't have an assistant BTW!)

Still worth checking the pedal bolts tho' - thanks.


Oli.
 
Nick,

Thanks.

Good Q. I'd guess about 2-3cm, although it's hard to measure. That's at the pedal, somewhere around the foot-pad bit. (Obviously it is less higher up the pedal.)


Oli.
 
It is probably due to this linkage. Alot of guys who race 944's use LHD shells because they don't have this linkage and therefore tighter brakes. I must admit i've not noticed it that much on my car. Maybe the joint bearings wear.
 
Scott,

LHD shells would be superior for this reason, I can well imagine.

I'm not sure if it is wear in the bearings, or just slack in the system. I was wondering whether anyone had any experience of this, or of removing it ... but no-one has (yet) piped up and said "Oh yes, you need to do XYZ".

Thanks for your input tho'.


Oli.
 
Don't see why there should be slack in the system if the rose joints are tights and not worn (assuming they are rose joints). I wonder if you could replace this mechanical linkage with a hydraulic one?
 
Scott,

I think it's wear in everything; a small bit of wear on each face will add up to a reasonable amount in the whole system. Rose joints and all.


Oli.
 
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