Brake problem

Glenn Briglio · 07-15-2018, 08:11 PM

Went from no problem holding the car at 3000 rpm on line to pushing thru the beam. Four wheel wilwood disc brakes.Mopar master cylinder( don't know piston diameter).Checked the pressure at each wheel. 1000 lbs coming out of master going to front brakes. 1000 lbs at front wheels. 800 lbs at rear and it will go no higher no matter how much more pressue you build up. I didn't have an adapter to measure pressure coming out going to rears.Couldn't swap lines from front to rear on master (different sizes). 3/16 lines going to fronts and 1/4 going to rears.

ss3011 · 07-15-2018, 09:21 PM

Refinish the rotors and install new pads !

Glenn Briglio · 07-16-2018, 06:24 AM

Quote:

Originally Posted by ss3011

Refinish the rotors and install new pads !

First thing done at track........no difference

nhramnl · 07-16-2018, 07:34 AM

Have somebody watch the car to see if the wheels are turning or sliding. Also, go over everything you've changed recently that might affect the brakes ability to hold the car, including even things like engine and converter changes. Finally, don't hold me to this, but 1000psi (front) and 800psi (rear) doesn't sound like an overabundance of clamping force.

Glenn Briglio · 07-16-2018, 07:53 AM

Quote:

Originally Posted by nhramnl

Have somebody watch the car to see if the wheels are turning or sliding. Also, go over everything you've changed recently that might affect the brakes ability to hold the car, including even things like engine and converter changes. Finally, don't hold me to this, but 1000psi (front) and 800psi (rear) doesn't sound like an overabundance of clamping force.

Nothing was changed. Front tires locked, rears are rotating and pushing car.The 1000 psi can go higher. The 800 at rears will not go higher no matter what pressure is coming out of master.

ss3011 · 07-16-2018, 08:01 AM

Is it possible to bleed just the rear brakes and recheck the pressure ? Could be an air bubble .

07-15-2018, 08:11 PM	#1
Glenn Briglio VIP Member Join Date: Nov 2002 Location: Massapequa Park,NY Posts: 1,206 Likes: 1,729 Liked 822 Times in 264 Posts	Brake problem Went from no problem holding the car at 3000 rpm on line to pushing thru the beam. Four wheel wilwood disc brakes.Mopar master cylinder( don't know piston diameter).Checked the pressure at each wheel. 1000 lbs coming out of master going to front brakes. 1000 lbs at front wheels. 800 lbs at rear and it will go no higher no matter how much more pressue you build up. I didn't have an adapter to measure pressure coming out going to rears.Couldn't swap lines from front to rear on master (different sizes). 3/16 lines going to fronts and 1/4 going to rears. __________________ 1989 Camaro Iroc-Z I/SA B&B Auto Machine Shop.

07-15-2018, 09:21 PM	#2
ss3011 Senior Member Join Date: Feb 2002 Location: Southeast Michigan Posts: 885 Likes: 63 Liked 221 Times in 102 Posts	Re: Brake problem Refinish the rotors and install new pads !

07-16-2018, 07:34 AM	#4
nhramnl Senior Member Join Date: Feb 2010 Posts: 504 Likes: 7 Liked 352 Times in 82 Posts	Re: Brake problem Have somebody watch the car to see if the wheels are turning or sliding. Also, go over everything you've changed recently that might affect the brakes ability to hold the car, including even things like engine and converter changes. Finally, don't hold me to this, but 1000psi (front) and 800psi (rear) doesn't sound like an overabundance of clamping force.

07-16-2018, 08:01 AM	#6
ss3011 Senior Member Join Date: Feb 2002 Location: Southeast Michigan Posts: 885 Likes: 63 Liked 221 Times in 102 Posts	Re: Brake problem Is it possible to bleed just the rear brakes and recheck the pressure ? Could be an air bubble .