After having a mechanic replace my brakes (I know I should have done it myself but I was feeling lazy) so after that pedal was real soft started going all the way to the floor. I brought it back and he said the brake master cyclinder seal is letting air in because they bled it and a little bit of air was still coming in. I have the acura shop manual and it seems pretty straight forward but do I need to bleed the replacement master cylinder before I install it? It did not specify to do this in the shop manual but the instructions that came with my mightyvan hand pump say to do this. Thanks.

 

I would re-bleed your current brakes right now.
make sure that the mechanic was telling the truth about the master cylinder.
if after your test, of re-bleeding the braking system and you find that the pedal is STILL traveling to the floor. then I would change the master cylinder.

Ive changed my master cylinder twice on my 3G TL.

 

Did the mechanic replace the pads or the calipers?

 

Yeah I thought about that. I thought by pushing the pedal all the way to the floor that I probably damaged the brake cylinder myself but as you said it might be worth a shot. Any particular reason yours had to be replaced twice? As far as I know mine is the original.

 

Replaced front pads and just machined the rotors.

 

Because of my own mistakes.
im embarrassed; butt I'll tell you.

When I first got the car the clutch was slipping. i noticed the fluid was low. poured fluid.
only wrong fluid and wrong reservoir
a petroleum product will destroy rubber seals.

master cylinder went out because of petroleum contamination.

installed a new master cylinder.
a year later; I had the infamous pedal to the floor.

ordered new master cylinder and when I was changing it out, I noticed I DID NOT remove the original shaft gasket.
there were two rubber gaskets against the firewall and MC.
this caused air to get into the MC.


It really is a simple job.
take off old MC.
put in new MC.
Be sure to take off old shaft gasket!

then fill her up with brake fluid.
and re-bleed.

 

^
hahahahaahahah

 

Hey Billy Sacco, as Justnspace suggested.......try rebleeding the brakes again first. The mechanic may have not done the proper bleeding sequence. If you did'nt have a problem before you had the mechanic install new pads....then there's a chance something was done wrong.

Simple things like replacing pads, are always best done by yourself if you have the time and skill to do so !

 

^ agree, he also may not have rebled them in the correct order either

 

Well bled the brakes and yeah the pedal is way better. It honestly was so bad after the mechanic I can't remember how it felt before but I think its back to normal. Hopefully I am in the clear . So if it gets worse will I probably need to do the master cyclinder?

 

^make sure; you got the correct bleeding sequence.

I had to have help. my friend bled it twice, because I still didnt think it was felt correctly...but then as soon as he got in, he was like...you're a fool justin...this is normal braking pressure.

if the pedal goes to the floor ALL OF A SUDDEN, then you know its the MC.

 

Yeah made sure to check the shop manual a few times. So far it has not suddenly gone to the floor. The fluid that came out was very dirty so that might have been part of my problem. Made sure to keep bleeding until I was getting new clean fluid.

 

glad to hear it!

 

Yeah Billy, chances are that you'll be ok. Too bad you were not able to do it right the first time, instead of getting lazy and relying on a shoddy mechanic. Next time you'll know better to DIY and save not only money, but unnecessary headaches !

 

You might also try getting the abs to engage a few times, then bleed one last time. If your pedal was that crappy, I bet your mechanic managed to get air in the abs system as well.

 

That or a leak in one of the lines or calipers. But it sounds like you solved it.

 

now that we got that out of the way...
no one mention my fuck up, okay?

 

What you did w the PS pump O ring I did with a toilet wax ring before. I cleaned the wax up but left the rubber part still in the pipe. Toilet refused to seat right and it was bugging me all that night. It actually and seriously came to me in my sleep that night what I did wrong. Same problem different area of life. We all fuck up, it's what keeps life interesting.

 

Good to hear that you solved your brake pedal issue. On a side note, you might want to look for a different mechanic next time around. Changing pads should not result in air in your brake lines.

 

Yeah thanks all and yeah no way I am going back there. Not sure WTH happened I have replaced pads and rotors a few times and never had anything even close to this happen.