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  #1  
Old 24th September 2014, 11:34 PM
Davidbolam Davidbolam is offline
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Default brakes

Took my car for a shake down run tonight (in the dark) with my mate. Everything went really well apart from the brakes kept binding on. I had to stop on 3 occasions to let the brakes cool down/release. It seems to be the rears. I had already backed off the handbrake to the point where this doesn't work so I know its not that causing the problem.

I have an inline pressure switch to activate the brake lights and when the brakes are locked on the brake lights remain on?

Has anyone got any suggestions?

Cheers

David

p.s my car has now done 10 miles!!!
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Old 25th September 2014, 07:59 AM
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Stot Stot is offline
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Do you have a brake proportioning valve of some kind? Is the pressure switch on the rear line after this? It could be sticking and not releasing pressure back to the master cylinder.

Cheers
Stot
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  #3  
Old 25th September 2014, 08:20 AM
Davidbolam Davidbolam is offline
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Quote:
Originally Posted by Stot View Post
Do you have a brake proportioning valve of some kind? Is the pressure switch on the rear line after this? It could be sticking and not releasing pressure back to the master cylinder.

Cheers
Stot
There is no valve in place. Just the switch.

David
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Build cost.... seems to be spending more on tools than car bits at the moment! (they will be handy in the future though).
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Old 25th September 2014, 08:53 AM
robo robo is offline
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If pressure is remaining in the circuit the piston in the master cannot be returning fully. So it can only be brake master related, this could be a piston sticking or the brake pedal not allowing it to return .

Bob
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Old 25th September 2014, 09:02 AM
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voucht voucht is offline
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Hi David,
How did you adjust the master-cylinder push-rod/clevis assembly? How did you adjust the brake pedal position? Sometimes, after having adjusted the brake pedal stroke and position, there may be apply a pressure applied on the master-cylinder, even when the brake pedal is released. Not enough to lock the brakes when cold, but it makes the all system heating up, and can lead to a break locking after a while (and even a brake loss if overheating). So perhaps you should try to momentary put your brake pedal as far back at possible (completely released with no pressure on the M/C), even if it is not comfortable, but just for checking if you still have this brake locking problem in these conditions (when you are sure the pedal is not applying any pressure on the M/C when released).
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Old 25th September 2014, 09:03 AM
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Quote:
Originally Posted by robo View Post
If pressure is remaining in the circuit the piston in the master cannot be returning fully. So it can only be brake master related, this could be a piston sticking or the brake pedal not allowing it to return .

Bob
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Old 25th September 2014, 09:57 AM
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K4KEV K4KEV is offline
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What about the pivot point of your brake pedal which would be the same as the mc piston sticking.
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  #8  
Old 25th September 2014, 10:36 AM
Davidbolam Davidbolam is offline
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I will have a look at both the pivot and make sure the bar isn't too long. I did get some nice photos though in Newcastle by night!

Everyone seemed to like it

Thanks for the help

David
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Saturn MX5 Based Chassis, Limited Slip Diff & 2.4 Quick Rack.

Build cost.... seems to be spending more on tools than car bits at the moment! (they will be handy in the future though).
Car iva'd and passed 15/08/2014. Finished weight 572kg.
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  #9  
Old 25th September 2014, 12:31 PM
Davidbolam Davidbolam is offline
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The other symptom is the brake gets really hard

David
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Saturn MX5 Based Chassis, Limited Slip Diff & 2.4 Quick Rack.

Build cost.... seems to be spending more on tools than car bits at the moment! (they will be handy in the future though).
Car iva'd and passed 15/08/2014. Finished weight 572kg.
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  #10  
Old 27th September 2014, 06:47 PM
flyerncle flyerncle is offline
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Front brake hoses cause problems like you descr
ibe if they are original
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