[cturboaddict]

Rear brakes keep sticking on my drag car bad.
New build.
93 Cobra Master Cyl- Manual (non booster)
Max Motorsports conversion kit (firewall bracket and pedal) and all lines.
Wilwood brake booster (max motorsports)
TBM line lock
04 Mustang front disc/calipers
Taurus rear calipers.
Rear has North Race Car Backets, as I have a 9" with Moser 8.8 ends.
Calipers are shimmed centered on rotor.
All flex lines are stainless braided.
E brake connected, but loose at rear brakes.

I've pressure bled this 3 times. No bubbles shown.
Everything will roll fine in neutral. Back car out of garage, everything is fine. Pedal feels fine.
Go down the road and medium braking, you can feel the pedal take another step and then the pedal goes rock hard.
Immediately the rear brakes grab and stay grabbed.

Let sit for a few minutes and it will release.
What am I missing?

 

[kjb302ho]

check the booster pushrod adjustment?

 

[cturboaddict]

View attachment 1089583
check the booster pushrod adjustment?

Dont have a brake booster.

 

[kjb302ho]

Dont have a brake booster.

well you have some kind of pushrod thats shoves up the ass of the mc don't you?

 

[cturboaddict]

well you have some kind of pushrod thats shoves up the ass of the mc don't you?

Yezzir, right up the pooper. Connected to the pedal, and it's adjustable.

 

[kjb302ho]

Yezzir, right up the pooper. Connected to the pedal, and it's adjustable.

do you have a .015 air gap?

 

[kruiser]

Wilwood brake booster (max motorsports)

Dont have a brake booster.

I'm confused, which is it. Booster or no booster?

 

[pkstang]

cturboaddict
is it just your rears that are locking up after some time?
not the fronts?
do you have an adjustable brake proportioning valve?

 

[superirish]

I've got one of those style tools from a corvette brake specialty shop, works pretty good.

View attachment 1089583
check the booster pushrod adjustment?

 

[cturboaddict]

Well..... I'm a dummy.
It was the fronts locking up, NOT THE REAR.
And it was from the Terminator X ECU controlled line lock. I had the pin configured previously to be a FAN. So it was triggering negative supply to the Line Lock from "above 180 degrees" and "above 600rpm".