Brake problems
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Senior User
Joined: Aug 2006
Posts: 201
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From: San Mateo
Brake problems
Just had a friend, who is mechanically minded do a front brake job on my truck. Pads, rotors, calipers, bearings, master cylinder etc. Put everything on, bled all the brakes, calipers and when we push on brake pedal, it goes all the way down to the floor like theres no pressure. clamped the front and rear lines to see if the master cylinder was failing. Brake pedal went half way down and held pressure. Not quite sure what to check next? Any ideas??
Post Fiend
Joined: Jan 2005
Posts: 8,402
Likes: 10
Would seem like there is still air in the system. Did you bench bleed the new master cyl before fitting it?
Did you bleed brakes in correct sequence? Correct order is right rear, left rear, RABS module, right front, left front.
Did you bleed brakes in correct sequence? Correct order is right rear, left rear, RABS module, right front, left front.
Fleet Owner
Joined: Aug 2010
Posts: 21,255
Likes: 1,657
From: Reynoldsburg, Ohio
Bench bleeding the master cylinder is vital when its replaced. Like Lazy K says there's still air in your system---its time to back up and bleed everything again, this time properly.
Post Fiend
Joined: Jan 2005
Posts: 8,402
Likes: 10
It is bolted to the inside of the drivers side frame rail about level with the drivers feet. Follow the brake pipe from the master cly down the firewall and you will come to it. There is a bleed screw on it and it is bled just like a brake.
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Cargo Master
Joined: Jun 2003
Posts: 2,982
Likes: 7
From: Somewhere Saskatchewan
If you changed the master cylinder the booster rod may need adjusting.
Remove the master and turn the adjuster out to contact the piston in the M/C.
Don't go too far or brakes will be applied all the time.
Remove the master and turn the adjuster out to contact the piston in the M/C.
Don't go too far or brakes will be applied all the time.
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