My son has a 1999 blazer cant seem to get air out of system.
I changed mc & bench bledstill goes to floor bled each wheel three times no good .MY ouestions are
1 If the abs pump is ng can i bypass it so even if that has air in it wont
go into the system ?
2. The pedal is hard with the engine off but when i start the engine it goes to floor.
What do i change the abs pump ? the brake booster , Im stumped Ive bled brake be never had this kind of trouble. Thanks Jim

 

Did the truck have a brake pedal b4 the replacement MC or is this why it was replaced? Did you start the bleeding at the wheels , starting with the RR,LR,RF,Lf and then the master?

 

Yes & Yes.

Okay so i plugged the vacummn booster & I have brakes & hard pedal if you press hard. Does that mean there is no air in system? Is power booster bad? is abs pump no good ?

 

Can anyone help?

 

I'm not an expert on this one, but I do believe the ABS pump needs to be bled first before you bleed the calipers. I would rule out a vacume booster at this time.

You may want to bleed the MC again just to make sure you got all the air out.

 

Where did you get the MC? Just because it is new does not mean it is good. A friend of mine had to change his three times before he got his brakes back (He tried to save a little money buy going to a less reputable auto part store). I would think if anything was wrong with your ABS it would set a code. Have you checked codes? How did you lose your pedal in the first place? If you pump the pedal while it is running does the pedal pump up and hold or does it go back to the floor?

 

I got mc in auto pro .i havent checked for abs code yet .The pedal does not pump up when running. I took the fuse out of the abs would i be bypassing that system ?
I also disconnected power brake hose & can brake the car with a lot of foot power.
how do i know if the mc is no good or the power booster.