brake help

[smokeyj]

On a 96 Acura Integra the brake pedal felt real squishy. so I bled the brakes to find out that the front drive and rear passenger calipers were getting fluid and performing correctly, but the front passenger and rear driver are getting fluid but not enough (instead of a full stream it drips out) so then I notice when you pump brake at master cylinder you hear air and a squeaky noise i looked for leaks as well didnt find any

added
I also noticed that when applying brake at idle it would go to one point stop and then you would feel like a bump in pedal then it would go down further to the floor syptom

Does any one know what this might be any help greatly appreciated

[Hektik]

Proportioning valve.

[bam-bam]

I'm not sure I agree. The diagonal separation of the brake system happens at the master cylinder.
You say no leaks- is the fluid level down at all? A master cylinder leaking back into the booster can destroy the vacuum diaphragm as well. Your hearing 'air leak' at m/c goes along with a vacuum leak from the booster. Does the engine surge when you apply the brakes at idle?

Loosen the master cylinder mounting nuts and ease it forward. There shouldn't be any fluid there.

[BUGMAN]

Most of the time you hear the squish when applying pressure to the brake pedal is the results of a bad master cylinder. I would bleed the brake system starting with the furthest point (rear passenger, then drivers rear, front passenger then drivers front) and working towards the closest. If this doesn't fix your issue at hand then I would focus more on the master cylinder itself.

[envision]

Most of the time you hear the squish when applying pressure to the brake pedal is the results of a bad master cylinder. I would bleed the brake system starting with the furthest point (rear passenger, then drivers rear, front passenger then drivers front) and working towards the closest. If this doesn't fix your issue at hand then I would focus more on the master cylinder itself.

+1

[smokeyj]

I'm not sure I agree. The diagonal separation of the brake system happens at the master cylinder.
You say no leaks- is the fluid level down at all? A master cylinder leaking back into the booster can destroy the vacuum diaphragm as well. Your hearing 'air leak' at m/c goes along with a vacuum leak from the booster. Does the engine surge when you apply the brakes at idle?

Loosen the master cylinder mounting nuts and ease it forward. There shouldn't be any fluid there.

fluid level stays up, when applying brake engine level doesnt seem to change but when you release pedal it speeds up some.I loosen master cylinder and there was no fluid in there just kinda greasy

I also noticed that when applying brake at idle it would go to one point stop and then you would feel like a bump in pedal then it would go down further to the floor

[smokeyj]

Most of the time you hear the squish when applying pressure to the brake pedal is the results of a bad master cylinder. I would bleed the brake system starting with the furthest point (rear passenger, then drivers rear, front passenger then drivers front) and working towards the closest. If this doesn't fix your issue at hand then I would focus more on the master cylinder itself.

shit I did this as well for two hours no pressure ever built up on rear driver or front passenger just the drip of fluid you dont even hear air coming out the bleeder valves. I thought it may have a leak I just couldnt see but when I pressed the brake with valve open fluid shot out correctly in a stream.

[BUGMAN]

Then Sir I would be looking into a new Master cylinder. How old is the car?

[jdmdb8itr]

the mc is going out.make sure theres no leaks at the prop. valve, or the calibers. sometimes the seals around the piston will try rot and have a small leak. if theres noting there then its the mc.

[Hektik]

I'm not sure I agree. The diagonal separation of the brake system happens at the master cylinder.
You say no leaks- is the fluid level down at all? A master cylinder leaking back into the booster can destroy the vacuum diaphragm as well. Your hearing 'air leak' at m/c goes along with a vacuum leak from the booster. Does the engine surge when you apply the brakes at idle?

Loosen the master cylinder mounting nuts and ease it forward. There shouldn't be any fluid there.


yea you're right... lol...didn't read the post thoroughly...

[Barefoot]

Proportioning valve.
+1