|
07-15-2018, 08:11 PM | #1 |
VIP Member
Join Date: Nov 2002
Location: Massapequa Park,NY
Posts: 1,206
Likes: 1,727
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 |
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, 06:24 AM | #3 |
VIP Member
Join Date: Nov 2002
Location: Massapequa Park,NY
Posts: 1,206
Likes: 1,727
Liked 822 Times in 264 Posts
|
Re: Brake problem
First thing done at track........no difference
__________________
1989 Camaro Iroc-Z I/SA B&B Auto Machine Shop. |
07-16-2018, 07:34 AM | #4 |
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, 07:53 AM | #5 | |
VIP Member
Join Date: Nov 2002
Location: Massapequa Park,NY
Posts: 1,206
Likes: 1,727
Liked 822 Times in 264 Posts
|
Re: Brake problem
Quote:
__________________
1989 Camaro Iroc-Z I/SA B&B Auto Machine Shop. |
|
07-16-2018, 08:01 AM | #6 |
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 .
|
07-16-2018, 09:02 AM | #7 |
VIP Member
Join Date: Nov 2002
Location: Massapequa Park,NY
Posts: 1,206
Likes: 1,727
Liked 822 Times in 264 Posts
|
Re: Brake problem
Could be an air bubble but have bled them 5 times. Nothing but a solid stream of fluid.
__________________
1989 Camaro Iroc-Z I/SA B&B Auto Machine Shop. |
07-16-2018, 09:36 AM | #8 |
Member
Join Date: Nov 2003
Location: Austin, TX
Posts: 219
Likes: 47
Liked 34 Times in 14 Posts
|
Re: Brake problem
Internal master cylinder leak only once the rear circuit gets to that pressure maybe?
__________________
K Danner STK 468 |
07-16-2018, 12:05 PM | #9 |
VIP Member
Join Date: Nov 2001
Location: Florida
Posts: 1,538
Likes: 34
Liked 132 Times in 48 Posts
|
Re: Brake problem
Maybe internal degradation of any rubber lines you may have? I heard that they can bunch up and cause internal restriction or blockage as they age.
I've had some trouble with holding the car on the line with OEM disc/drums lately and this thread made me realize that the brake "T" assembly on the rear end housing is the only rubber hose I still have in the system. M/C has been changed and all the other lines are solid or braided. I put a higher priority on the rear brakes because harnessing the torque there will accomplish more than at the front. The best front brakes still only have a pair of skinny front runners trying to hold the car and can easily slide.
__________________
LOCOMOTION Racing |
07-16-2018, 12:27 PM | #10 | |
VIP Member
Join Date: Nov 2002
Location: Massapequa Park,NY
Posts: 1,206
Likes: 1,727
Liked 822 Times in 264 Posts
|
Re: Brake problem
Quote:
__________________
1989 Camaro Iroc-Z I/SA B&B Auto Machine Shop. |
|
|
|