Brake issues

[wes3337684]

Well 2 weeks ago my rear brake line rusted out on the frame by the fuel tank, brake fluid tank ran dry in rear, so fixed line and bleed rear braks twice, stoped better than ever. This weekend took boat to the lake, backed down ramp put on parking brake, unloaded boat released brake and took off to park then pedal goes to the floor almost but still stops.
Now I drive home still bad brakes, try bleeding the rear again no air what gives. Bad master maybe I can't figure it out.

 

[grimm]

Could be a bad/leaky master cylinder. But a leak anywhere in the system can cause similar results. Inspect all lines/hoses/connections at all points in the brake system. Have a friend or someone help you by pumping the brake while you inspects these pieces. If your pedal went to the floor, there's air and/or a lack of fluid in there somewhere.

In my other ride, one morning, everything felt fine on my way to work, when I parked my car it felt fine. When I got off work, the pedal went all the way to the floor. My master cylinder was bad. Easy, although slightly time consuming fix.

If find for certain that there are no leaks, go through and properly bleed your brakes at all 4 wheels and make sure everything is tightened correctly. Hope that helps.

 

[wes3337684]

Is there a way to test the master cylinder? I see no leaks anywhere on any lines or around the master and brake booster.

 

[grimm]

What I would recommend is to check all the hard line fittings into the master cylinder, make sure they are tightened properly, make sure the master cylinder itself is correctly attached the brake booster. Bleed your brakes at all 4 wheels properly. Make sure you have the proper level of fluid in the reservoir and don't let it drop too low when bleeding as air can enter the system and you'll have to start all over basically. Once they are properly bled, you can take it from there. If everything works properly and it doesn't happen again, it could have just been a simple mistake in the bleed process. If it does happen again, you have a leak somewhere and you just can't see it.

---------- Post added at 02:07 PM ---------- Previous post was at 02:06 PM ----------

Also, take into consideration the ABS pump when bleeding, as this needs to be air free too.

 

[wes3337684]

Is there a way to bleed the abs pump thats the only thing I can think of cause there no leaks I've been driving it all day and the fluid level is the same.

 

[grimm]

There's different methods, for sure. The one I know is to have the car on jack stands, get the wheels moving, then hit the brakes, locking up the wheels. This will engage the ABS thus actuating the pump and cycling fluid. Proceed with bleeding from there. That has worked for me in the past.