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Front discs very very hot


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Morning all ... before I start tearing the brakes apart any suggestions regarding this......

So last weekend I took my 65 tr4a for a spin , seemed to be sluggish put it down to first outing this year... however when I put the car in the garage I could smell brakes and they were way to hot to touch .... so this morning I go out in the car early , drive about 1/2 mile and pull into a lay bye let car drift to a stop.. hadn't applies the brakes at all ... brake discs were very very hot....... pedal feels way way firm .... any obvious things to look at rule out ? I have read about a valve ? Where would this be located, I can't see anything from under the bonnet...

appreciate any advice thankyou

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Valve would be in the master cylinder, but first thing to do is to check that the master cylinder piston is returning fully when foot off pedal.

Is there an adjustable end stop for the pedal lever - early cars had them a '4 probably would not.

 

Bob.

 

P.S. if both discs were hot, then that rules out a problem at the wheels, must be master cylinder

Edited by Lebro
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Hi Sperry,

when they have become hot have you raised the wheels and tried to turn by hand.

Are the wheel bearing too tight?

Have the bearing been adjusted over the winter?

 

You say it is the first outing of the year - when was the last outing of last year. Was it put away wet.

 

Could be seized brake caliper pistons.

 

Roger

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Wheel bearings have not been touched at all . Last time I used it was probably November in the dry .... I have just checked the master cylinder it seems fine returns fine . Got the car jacked up wheels spin freely when brake applied they stop then spin freely again .. you can hear the pads slightly against the disc but nothing to hinder rotation .... all seems fine ..... iam stuck

Am I trying to fix something that's not broke?

Seemed strange the discs were getting very hot though ..... even without use

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You could try pushing the pistons back into the calliper - only a tiny bit - that should free them if they are sticking.

be careful not to spill fluid from the reservoir though - maybe empty some out first.

 

Bob.

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I'm thinking (since you seem to have done all the

obvious checking) that the rubber hydraulic pipes

may have swelled up inside, causing the pressure

under braking to not be released.

 

That possibility doesn't tie in exactly with your fault

diagnosis, but from what you say:

1) Brakes must be binding, or they wouldn't get hot;

2) From your checks on the wheels spinning freely,

being jacked up and after braking - contradicts

your driving experience.

 

If you cannot find the fault and run out of ideas, then

replace the hydraulic rubber pipes. They CAN swell

up during storage.

 

AlanR

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Same thing happened with a friend's Healey. We were able to released the pressure at the bleed screw, he would drive a short distance and the system would pressurise again. It was obvious to me following as the brake lights came on even though he never touched the brakes. This all happened after we changed the calipers, as one of them was definitely siezed.

 

Fitted new flexible hoses and no problems since........thinking back we may have done damage to the hoses when we clamped them to remove the calipers.

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