Possible brake problem

Possible brake problem

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Discussion

kevd

Original Poster:

177 posts

162 months

Monday 23rd January 2017
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Hi All. I think I may have a brake issue, that I need some advice on. The issue is; with the car stationary, and engine running if I press really hard on the brake pedal it is firm, but I can feel a definite mechanical stop that will not allow the pedal to depress any further.
Now on the road the brakes seem to work fine, however I did have to do an emergency stop when the brakes were still cold, and I could feel the mechanical stop against the pedal without being able to lock the front wheels although it felt very close to doing so. It did not feel as though I was getting full braking. When the brakes are nice and warm if I put this much pressure into the pedal I would easily be able to lock the front wheels. I am putting this down to purely the need to warm up the pads (EBC Yellow Stuff)before they work properly, but I am concerned that the mechanical stop is not allowing me to use full braking.
I have Yellow Stuff pads on all 4 corners, std rear calipers and discs, with HiSpec front calipers 283mm discs, braided hoses, I have bled the whole system numerous times including the bleed nipple on the master cylinder.
Any thoughts on this will be gladly received. Thanks

phillpot

17,125 posts

184 months

Monday 23rd January 2017
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Doubts about your brakes? Get an expert to take a look.

bluezeeland

1,965 posts

160 months

Monday 23rd January 2017
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If you are not comfortable round brakes, get indeed an expert to have a look at them......

I too have EBC Yellow all round but don't need to warm them, it sounds like there is a problem with thickness of pads (you haven't told us how old they are) or condition of the flexes, visual condition of the M/C, fluid level, and age of fluid.....

RobXjcoupe

3,186 posts

92 months

Monday 23rd January 2017
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Go to your local mot man and have him just do the brake test on each wheel and see what the results are, but I know if I leave my regular car undriven for a week or so the front brakes do seem to glaze over when cold which goes away the next time I brake.
With regards to a mechanical stop, I have driven my Griff and the master cylinder failed whilst braking. The brake pedal simply went to the floor as approaching a t junction. Luckily there was no traffic and I managed to stop on the other side of the junction with the handbrake and just pure luck! Up to that moment my brakes were perfectly fine.
It's possible yellow stuff pads are not good from cold.

kevd

Original Poster:

177 posts

162 months

Monday 23rd January 2017
quotequote all
The fluid was replaced last year with Castrol DOT 4. Rear pads are about 40% worn. fronts only about 20% worn. all flexible hoses are within 3 years old, and are braided stainless.