Peruviann83

1994 Acura Integra LS Auto ABS

when i get in my car with it off brake pedal goes all the way down like it has no pressure the more i pump it the pressure eventually comes back

so today i had someone from the marketplace come change my MC and helped a lil but still the same

one question when u change the MC on a car with ABS do u have to bleed all the brakes he bleed the mc but not the brakes ?

425_Booster

prob brake booster leaking and isnt holding pressure. so thats why when you pump you eventually build some pressure up. get that checked.

Peruviann83

anyway of telling forsure its the brake booster ? kinda broke at the momment and that piece is around 165

425_Booster

First Id check the lines and fitting and make sure nothing is worn/cracked, then make sure everything tight and hasnt worked itself loose.

Peruviann83

also the person who installed my MC said i didnt need to bleed my brakes cause it was abs i was like are you sure he said yeah im positive i do this all the time

i mean i dont know bout motors and brakes much but that didnt sound right to me

425_Booster

I prob would have. He mightve said that so he could move on to another car and didnt want to deal with that part....to be honest.

Peruviann83

damn and he came to my house probably didnt feel like bleeding the brakes

425_Booster

yep

Peruviann83

damn this sucks cause ive never worked on a car and im not trying to pay someone to come bleed my brakes

PatrickGSR94

iTrader: (1)

That guy doesn't know what he's talking about. Of course you have to bleed your brakes.

Now first of all, if the car is OFF, you should be able to easily pump the brake pedal (should feel normal) for at most 2 pedal pumps. After that, it should get rock hard. I once had a problem where I could hear residual vacuum escaping after I shut off the car, and the pedal would ALWAYS be hard with the car off no matter what. It turned out to be a trashed brake MC piston seal, located right in between the MC and the booster on the piston shaft. I believe this was trashed by the MC brace I used to have on my shock tower. When a mechanic friend suggested the brace may have trashed the seal, I tossed that thing out with a quickness, and replaced the seal while I had my engine pulled out.

Another problem I had was the brake pedal slowly sinking to the floor while the engine was running and I was stopped at a traffic light or whatever. This was due to a bad brake MC, which I replaced with an OEM Nissin rebuilt unit, and it has been fine ever since.

Now, on 94-97 Integras, the ABS is a completely separate system from the regular brakes, and includes its own reservoir (98-01 cars had the ABS using the regular MC's reservoir).

When installing a brake MC, you first need to bench-bleed the MC to remove any air from inside it. Then you bolt it to the booster, and attach the hard brake lines, and then bleed the brakes at each wheel. This is because air is in the lines due to the lines being disconnected from the MC. If you didn't bleed the brakes or even bench-bleed the MC when installing it, you probably have tons of air in your lines, which causes a mushy pedal feeling (air can be compressed, brake fluid cannot).

Peruviann83

Thanks for the nice reply !