sperry14 Posted March 25, 2017 Report Share Posted March 25, 2017 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 Quote Link to post Share on other sites
sperry14 Posted March 25, 2017 Author Report Share Posted March 25, 2017 Sorry forgot to mention no servo fitted. Quote Link to post Share on other sites
Lebro Posted March 25, 2017 Report Share Posted March 25, 2017 (edited) 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 March 25, 2017 by Lebro Quote Link to post Share on other sites
RogerH Posted March 25, 2017 Report Share Posted March 25, 2017 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 Quote Link to post Share on other sites
sperry14 Posted March 25, 2017 Author Report Share Posted March 25, 2017 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 Quote Link to post Share on other sites
Lebro Posted March 25, 2017 Report Share Posted March 25, 2017 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. Quote Link to post Share on other sites
TR 2100 Posted March 25, 2017 Report Share Posted March 25, 2017 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 Quote Link to post Share on other sites
Lebro Posted March 25, 2017 Report Share Posted March 25, 2017 Yes, but any pressure inside them whether swelled up or not should be released as soon as the pedal come back up. Bob. Quote Link to post Share on other sites
TR 2100 Posted March 25, 2017 Report Share Posted March 25, 2017 Yes, but any pressure inside them whether swelled up or not should be released as soon as the pedal come back up. Bob. In a word - No. In two words - Not Necessarily. AlanR Quote Link to post Share on other sites
kob666e Posted March 25, 2017 Report Share Posted March 25, 2017 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. Quote Link to post Share on other sites
AndyR100 Posted March 25, 2017 Report Share Posted March 25, 2017 My money is on collapsing walls of the front flexible hoses ...... andy Quote Link to post Share on other sites
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