master break cylinder

1991HB · #1 08-04-2006, 03:31 PM

I replaced by master brake cylinder today and now I don't have any brake at all. The brake pedal goes further down than before with the old master cylinder. All I did was take the old one off and put the new one on. Any ideas? Was I suppose to do something else before putting the new one on. Any help would be great...maybe some step by step directions...I don't know anything. Thanks.

Smoghog · #2 08-04-2006, 05:19 PM

Quote:

Originally Posted by 1991HB

I replaced by master break cylinder today and now I don't have any breaks at all. The break pedal goes further down than before with the old master cylinder. All I did was take the old one off and put the new one on. Any ideas? Was I suppose to do something else before putting the new one on. Any help would be great...maybe some step by step directions...I don't know anything. Thanks.

You have air in the "brake" lines you need to bleed your brakes.

crx2034 · #3 08-04-2006, 06:25 PM

yes and i am pretty sure you need 2 people to do this( correct me if i am wrong). I had a freind who bled his own brakes and i was like, there is no way to bleed your brakes by yourself.

1991HB · #4 08-04-2006, 09:13 PM

Thanks a lot guys...it really helps. I thought I bought a new part and it didn't work. I'm kind of new with this so how exactly would I go about bleeding the brake lines

1991HB · #5 08-04-2006, 09:41 PM

another quick question I got. There are 2 bolt sticking out of the booster that the master cylinder goes onto. One of the bolts are broke off from someone tightening it to tight. Would it be a big problem if I didn't use that one bolt as long as I have the other one and it's tight. If I do need it can I get it at a part store or something. And how do I get the rest out. There is still a little bit sticking out if I can just use pliars and just screw the rest of it out. Thanks.

hondacivic99sivtec · #6 08-05-2006, 05:07 AM

Quote:

Originally Posted by 1991HB

another quick question I got. There are 2 bolt sticking out of the booster that the master cylinder goes onto. One of the bolts are broke off from someone tightening it to tight. Would it be a big problem if I didn't use that one bolt as long as I have the other one and it's tight. If I do need it can I get it at a part store or something. And how do I get the rest out. There is still a little bit sticking out if I can just use pliars and just screw the rest of it out. Thanks.

you can always drill it out and then tap and dye it. but that's just me.

Smoghog · #7 08-05-2006, 10:18 AM

Quote:

Originally Posted by 1991HB

another quick question I got. There are 2 bolt sticking out of the booster that the master cylinder goes onto. One of the bolts are broke off from someone tightening it to tight. Would it be a big problem if I didn't use that one bolt as long as I have the other one and it's tight. If I do need it can I get it at a part store or something. And how do I get the rest out. There is still a little bit sticking out if I can just use pliars and just screw the rest of it out. Thanks.

Bleed, Two people or a vacuum pump and the correct fitting.
Bolt, You can swap out the brake booster. Other than that the tap thing will work. but alot harder.

hondacivic99sivtec · #8 08-05-2006, 05:11 PM

yeah if u tap it it will be harder and will take a lot of patience.

johnb16a2 · #9 08-06-2006, 08:41 AM

Quote:

Originally Posted by 1991HB

another quick question I got. There are 2 bolt sticking out of the booster that the master cylinder goes onto. One of the bolts are broke off from someone tightening it to tight. Would it be a big problem if I didn't use that one bolt as long as I have the other one and it's tight. If I do need it can I get it at a part store or something. And how do I get the rest out. There is still a little bit sticking out if I can just use pliars and just screw the rest of it out. Thanks.

My first question for you is did you bench bleed the master cylinder before installing it in your car? This is a VERY important first step and took me about 45 min of pumping to get all the air out of my replacement master cylinder (zero bubbles floating around in the fluid). I also agree a helper is essential for brake bleeding if you don't have a "one man" bleeding gizmo.

I've always bleed brake systems by starting with the farthest wheel from the master cylinder and work your way closer to the master cylinder. (ie. 1. passenger rear, 2. driver rear, 3. passenger front, 4. driver front and always making sure the reservoir is topped off).

If I understand your post, one of the master cylinder mounting studs sticking out of the booster broke off? If there are enough treads left sticking out you can go to the dealer or junkyard and get a replacement nut. But if you can't get a nut on the stud I highly discourage using only one mounting point for your master cylinder. The best solution is replace the booster with a new or reman unit, as disassembling the booster to replace the stud is rather complex, but if funds are short you can get one easily in a junkyard but again these are your brakes, and IMO this is one of those systems you SHOULD NOT skimp on. Please keep us posted. GL

1991HB · #10 08-13-2006, 04:18 AM

well i got the master cylinder on and everything bleed. I still only have one stud for the master cylinder but I will get that fix soon. I just needed to get the car going. Thanks for all your help guys.

Tony · #11 08-13-2006, 11:42 AM

Ive never had a problem bleeding the brakes by myself without one of the gizmos. Granted I'm sure its not 100% bled, but its pretty damn good. That is how I had bled my race car for the fact no one else was around to help and I haven't had a problem out of them yet. Ive also bled a friends race car with only me and I drove his car that week and got his rotors cherry red from how hard I was on them that night. All I ever do is loosen the bleed screw off, pump the brakes until it starts shooting fluid out, and tighten the screw. Even if you don't agree with this, I haven't had an issue and would drive the car on the road like this, and if you want to continue bleeding, this atleast gets most of the air out.

thefooshmeister · #12 08-13-2006, 02:02 PM

yeah ive done the same thing tony. probly not the best way to do it but hey when youre in a pinch ya gotta do what you can. definately wasnt fun bleedin them by myself, had to use a brick to hold the brake down

Tony · #13 08-13-2006, 03:37 PM

i didn't even do that, i just pumped it until fluid came out, got out and closed it off, lol. Like I said, its not the best, but if thats all you can do, its a hell of a lot better than leaving it alone, I haven't had to pump the brakes on either car because of air yet, so I'm happy with it.

YZ125rider21 · #14 08-15-2006, 12:35 PM

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ATMDC · #15 08-20-2006, 03:21 PM

your you can buy aftermarket one way valve brake bleeder screws so you can bleed them yourself. ive never used them so i dont know how good they work.

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