Brake bleed
Fleet Mechanic
Joined: Jul 2017
Posts: 1,276
Likes: 12
From: KY
Gravity bleed if you have no pump , I replaced my entire brake system , lines booster , master cylinder replaced ,, and proportional valve was off , no fluid at all in system ,instructions below , when I did mine I sucked the fluid into the clear tube from bleeder valves and did all 4 wheels and watched for air bubbles once no bubbles I was done , I lost no fluid on the ground , first pump to the floor 2nd pump full pedal and never looked back and one man job,,sometimes its full pedal first pump , depends on the car or truck in question , I do this on new or older vehicles and even if its one wheel that had issue or leak , its simple an works every time , I do bench bleed the master cylinder if its been replaced or you can do it after its mounted on booster if you have bleeder lines as I do attached to the master cylinder , the bleeder line threads in the side of master cylinder were steel brake lines would normally go , then both plastic bleeder lines flip up to top an put in reservoir of master cylinder , while full of fluid you pump pedal slowly till bubbles stop coming out in master cylinder reservoir ,,hook steel brake lines up and the gravity bleed ,,some cases you have to recenter proportional valve but its easily done
- Simply leave the lid off of the master cylinder and top it off with fluid. Be sure never to let the reservoir go empty, checking the level of fluid frequently is important.
- On a typical Street Rod application you will start by loosening the caliper or wheel cylinder farthest from the master cylinder, the passenger rear, then the left rear, right front, and left front. It’s helpful to attach clear tubing onto the bleeder valve to route the fluid away from the wheel into a bottle to observe any air bubbles coming out. On other applications, you may consider referring to the manufacturers recommendation for the bleeding sequence.
- The amount of time you leave the bleeder open may vary, but a general rule of thumb is to let it bleed until the fluid runs clear and free of bubbles. Re-tighten and repeat this step at each wheel.
- Before test-driving, check the pedal, it should feel firm when depressed and it should hold constant pressure without dropping .
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