All,
I've done a brake overhaul on my '91 NSX and could use help troubleshooting. It had APR calipers up front with rear OEM calipers and a semi-functioning ABS unit. I recently installed a Stoptech BBK for the rear (after powder coat), reinstalled APR BBK up front (after powder coat), and installed a P2F ABS delete kit.
Current Symptoms:
1) Front calipers appear to be doing all of the work with very limited rear braking. I tested this with the car on jack stands and the fronts engage before the rears do. I adjusted the Tilton proportioning valve all the way open to try and maximize fluid pressure to the rear, but experienced little/no improvement.
2) Front passenger caliper brakes more than the front driver side. I know this from locking up that wheel consistently under hard braking.
Attempted Remedies:
1) Bled the system twice by myself, and had a shop machine bleed it once.
2) Inspected all calipers for leaks/stuck pistons.
Specific Questions:
1) Is the bolt pictured below in the middle of the Master Cylinder just a plug? I could not find anything on the internet or in the service manual that this does anything, unless it is somehow used to adjust the piston to pushrod clearance. I was fantasizing that this somehow adjusts bias, but I'm sure it doesn't.
2) Does the front outlet and rear outlet on the Master Cylinder produce the same pressure/fluid volume? I realized after the fact that I reversed the front and rear lines to the master cylinder. Would switching them back result in any change?
3) Is the lack of rear braking likely air in the lines? The last time I bled the rears, there were no air bubbles coming out.
4) Does anyone know of a way to troubleshoot the proportioning valve? I adjusted it from full open to full closed and it didn't seem to greatly affect braking performance.
I could use a braking wizard to help me troubleshoot. Pictures of the setup are below. I am fully prepared to be roasted on my silly brake setup, but I assure you, reusing old parts was the original plan...
I've done a brake overhaul on my '91 NSX and could use help troubleshooting. It had APR calipers up front with rear OEM calipers and a semi-functioning ABS unit. I recently installed a Stoptech BBK for the rear (after powder coat), reinstalled APR BBK up front (after powder coat), and installed a P2F ABS delete kit.
Current Symptoms:
1) Front calipers appear to be doing all of the work with very limited rear braking. I tested this with the car on jack stands and the fronts engage before the rears do. I adjusted the Tilton proportioning valve all the way open to try and maximize fluid pressure to the rear, but experienced little/no improvement.
2) Front passenger caliper brakes more than the front driver side. I know this from locking up that wheel consistently under hard braking.
Attempted Remedies:
1) Bled the system twice by myself, and had a shop machine bleed it once.
2) Inspected all calipers for leaks/stuck pistons.
Specific Questions:
1) Is the bolt pictured below in the middle of the Master Cylinder just a plug? I could not find anything on the internet or in the service manual that this does anything, unless it is somehow used to adjust the piston to pushrod clearance. I was fantasizing that this somehow adjusts bias, but I'm sure it doesn't.
2) Does the front outlet and rear outlet on the Master Cylinder produce the same pressure/fluid volume? I realized after the fact that I reversed the front and rear lines to the master cylinder. Would switching them back result in any change?
3) Is the lack of rear braking likely air in the lines? The last time I bled the rears, there were no air bubbles coming out.
4) Does anyone know of a way to troubleshoot the proportioning valve? I adjusted it from full open to full closed and it didn't seem to greatly affect braking performance.
I could use a braking wizard to help me troubleshoot. Pictures of the setup are below. I am fully prepared to be roasted on my silly brake setup, but I assure you, reusing old parts was the original plan...