Jump to content

2377kN

Brake Booster Failed, couple questions...

Recommended Posts

On the way to work this morning my brake booster failed, so drove back home and parked it.  It's a '75 2+2, so it's the larger 10.5" brake booster.

I will most likely either send mine out to boosterdeweyexchange.com or pick one up from Motorsports Auto.  Any reason to pick one over the other?

Is it possible to remove/replace the brake booster with out affecting/introducing air to the brake lines?  The FSM is vague and searching online for a couple hours didn't give a clear answer.   I do not have access to anywhere close by I can bleed brakes, so will have to farm out the work if that’s the case.

Share this post


Link to post
Share on other sites

Normally you can pull the master cylinder far enough away from the booster to get the booster out. The lines will flex or bend enough to do this with out unhooking them.

MSA is using a rebuilder I'm sure. I think price would be my first consideration. Also your master cylinder is most likely leaking into the booster causing the failure. That would require replacement and bleeding if it's the case. There will be a lot of corrosion at the end of the master cylinder and many times you can pour excess brake fluid out of the booster. The fluid destroys the internal diaphragm

Share this post


Link to post
Share on other sites

Ok then, 

I'll source a master cylinder as well and have a local shop do the install.  My brake booster looks beat and old, probably original.  Master cylinder looks way to shiny to be original.

Thanks for the info Patcon.

Share this post


Link to post
Share on other sites

You could do that or try pulling the booster first. If the master isn't corroded on the rear end then you could just replace the booster and move on. That would be cheaper and you could do all the labor. If you have questions post up some pictures

Share this post


Link to post
Share on other sites

I hung my masters in place from my garage ceiling with some nylon cord then removed/replaced the booster. Easy enough but the nuts above the brake pedal were a real pain to get back on. Took a couple of hours but saved some dough ray me. LOL

Got my rebuilt booster from amazon.com, painted it satin black and glued the Bendix red sticker onto the new one. Looks original too. Good luck!

Share this post


Link to post
Share on other sites

You can remove the screw/bolt from the junction blocks of the hydraulic lines down on the fender well and frame rail.  That will give you a lot more flex in the lines to the MC and let you leave everything connected.  You might find fluid leaking from the back of the MC though once you get it apart.  That's the common reason the booster fails.  Don't let any fluid leak from the booster on to your paint.  It will stain it, or worse.

 

  • Like 1

Share this post


Link to post
Share on other sites

Thanks for the info everyone.  I called up Booster Dewey Exchange and Power Brake exchange.  Dewey has all the parts for a rebuild but the diaphragm.  So going to my booster to the Power Brake Exchange SoCal location. 

Sprayed some Kroil on the bolts and did a deeper inspection.  Going to get a new Brake Master Cylinder.  Looks like the only choices are Cardone, Beck/Arnley, or Centric. Any reason to pick one over the others? 

This doesn't seem like too hard of a job so I will probably head to the closed down toys-r-us parking lot that's not very far and do the job there.  Replaced my fuel pump there a couple years back and had no problems.  Worst case scenario I have AAA.

 

Share this post


Link to post
Share on other sites
8 minutes ago, 2377kN said:

Sprayed some Kroil on the bolts and did a deeper inspection.  Going to get a new Brake Master Cylinder.  Looks like the only choices are Cardone, Beck/Arnley, or Centric. Any reason to pick one over the others? 

Whichever you get take it apart and clean the bores out before using.  Sometimes they leave honing grit inside that will kill the seals pretty fast.  Reman quality.

Share this post


Link to post
Share on other sites

Got the booster out over the weekend and sent it off to be rebuilt.  I hope to have it back by Memorial Day Weekend.

The master cylinder was not leaking any fluid, but I don't trust it anymore.  Going to replace it.

Also ordered new master and slave clutch cylinders.  Gonna head to the DIY garage in Baldwin Hills, CA to do that in a couple weeks.

 

Thanks everyone for the info,  I'll update when the job is complete.

  • Like 1

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use. We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.