mkIV complete kit - front rotors overheating w whitbys assist

[mcwho]

I was out with the Deep South Cobra club event this weekend. The passenger side front rotor overheated so we cooled it down before continuing. The next day, the drivers side rotor overheated. I have just about 2000 miles on the car. This is my 3rd event in as many years where we drive 100 to 300 miles for the event.

[Norm B]

Did you adjust the pushrod out of the brake booster to allow the master cylinder to fully return when the brakes are released? The other possible problem is the lack of or too small of a spacer between the front of the foot box and the booster. Both of these will cause the brakes to still be on when the pedal is released.
The other possibility is sticking caliber pistons but, to have them stick and release on opposite sides is almost impossible.

HTH

Norm

[CraigS]

What norm said. You actually have two pushrods that need to have clearance. Pedal to booster and booster to MC. On a standard setup a repair manual usually provides a procedure to measure the pushrod inside the booster and a way to measure to where the pushrod contacts the MC so you can subtract 2 numbers and hopefully have .005-.010inch (these are wild a$$ guess #s) clearance.

[mcwho]

it was a long time ago when I put this together and I did use a specer between the firewall to booster. I didnt have the tool that is usually used to measure the booster to M/C rrod clearance but mmeasured it another way. I believe you are right about it NOT being a caliper issue, Will likely remove M/C and mmeasure slearances from there.

btw I am using a "Corvette style " master cylinder that has integral reservoirs cause i could not find a way to mount the remote reservoirs high enough.

[wallace18]

I have had issues with Whitby setup the car hot vs cold. The unit does expand when hot. I had to increase the gaps so when heat soaked the front calipers were not engaged.

[mcwho]

Hello Wallace,
I have been fighting the front brake overheat issue since my post on 10-25-2020. up until today the front calipers only overheated up one time. Today was the second. i loosened the bolts between the booster and the MC back then to allow more clearance between them. Not sure if this helped.

Since I once owned a stock 2000 mustang GT and had the same front brake overheat and lock up issue i have been of the belief that it was the calipers. since then I have acquired new calipers and the STEEL pistons available from rauto (carlson 7964). I realize that I am barking up two trees. I am planning to goto the Reptile Roundup event in Lakeland next week dont want to get straded.

[wallace18]

Hello Wallace,
I have been fighting the front brake overheat issue since my post on 10-25-2020. up until today the front calipers only overheated up one time. Today was the second. i loosened the bolts between the booster and the MC back then to allow more clearance between them. Not sure if this helped.

Since I once owned a stock 2000 mustang GT and had the same front brake overheat and lock up issue i have been of the belief that it was the calipers. since then I have acquired new calipers and the STEEL pistons available from rauto (carlson 7964). I realize that I am barking up two trees. I am planning to goto the Reptile Roundup event in Lakeland next week dont want to get straded.

I would keep a 9/16"-1/2" wrench and when the front brakes start to drag, see if loosening the master cylinder at the booster fixes the drag. If it goes away clearance of rod is issue. I had this happen to a MK4 and A 35 P/U. Both times it was when car engine was hot. I finally got right amount of rod clearance and they never dragged again. This is what I had happen. Possibly not your issue.

[stielow]

https://www.amazon.com/Sunyat-Power-Booster-Pushrod-Adjustment/dp/B07ZFDT3BK/ref=asc_df_B07ZFDT3BK/?tag=hyprod-20&linkCode=df0&hvadid=390793851744&hvpos=&hvnetw=g&hvrand=11339275085065722800&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9029676&hvtargid=pla-840813405758&psc=1&tag=&ref=&adgrpid=81740139242&hvpone=&hvptwo=&hvadid=390793851744&hvpos=&hvnetw=g&hvrand=11339275085065722800&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9029676&hvtargid=pla-840813405758 Thats a great tool to make sure you have enough gap.