Location of back brake master cylinder on a 1985 Yamaha venture totaled 1200

SOURCE: Spongy brakes after bleeding them 2 times. Should I try to bleed the master cylinder or replace it?

Honestly your guess is as good as mine. But I don't think the master cylinder is NOT bad you still have air in the system. Get a big bottle of brake fluid bleed all four sides until you run out of fluid or your brakes work properly. You should divide the bottle's content in four, then use each quantity in each side. You'll be removing air and contaminated fluid from the system. Get a small hose that fits on the bleeders and an appropriate container. I have a good feeling if you do this your brakes will work just fine. I don't know how you are bleeding the brakes. I'll let you know the proper way just in case. This is a two man job, with the wheel off, have someone start the car. Have them pump the brakes a few times to get pressure. 1With the brake pedal UP open the bleeder, 2then have your assistant press the brake pedal all the way down and leave it completely pressed down. 3Close the bleeder valve, once close and only with the valve closed have'm release the brake. Repeat as necessary, bake depressed, open valve first then press brake. DO NOT depress until valve completly closed. Close valve THEN depress. Good Luck!

SOURCE: 2003 town and country brake problem

Did your mechanic use a DRB III or equivalent scanner before performing the bleeding procedure after installing the master cylinder? This is a requirement by the manufacturer (Chrysler) when bleeding the brake system.

SOURCE: brake lock-up

I suspect that you have front disc and rear drum brakes.You did not say which of your brakes are locking up. I suggest that if your front brakes are locking {skid} that means your rear brakes are not engaging. If your rear brakes are locking {skid} then I suggest you have problems with park brake or brake fluid leaking onto the rear shoes.
More info would help me help you. I will check back soon.

SOURCE: brake bleeding

if you didn't bleed the lines after putting the master in. then there is a good chance there is air in the lines now. may go through a quart of brake fluid before all the air is out. remember to start at r-rear/ l-rear/ r-front/ l-front last.will take some time. don't forget to adjust the rear brake while your there to help with the pedal

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