1991 Mazda B2200 pedal goes to floor

GCARDIN1

MEMBER
1991 MAZDA B2200

Brakes problem
1991 Mazda b2200 4 cyl Two Wheel Drive Manual

my brake pedal goes to the floor when pressed. When I pump it 3 or 4 times I get brakes but it dives like it is only the front brakes engageing. I have replaced the rear wheel cyclinders, adjusted the rear brake to proper setting, replaced the master cyclinder, and leaking lines and also bled the system completely, the only thing left that I could think of would be the proportioning valve but I really dont want to put any more money in to it. I am thinking of replaceing the brake hoses starting with the rear one and working my way forward but I am still getting good fluid through the hoses. Any ideas before I put more cash into this thing?

1 Reply

MASTERTECHTIM

MECHANIC
4,750 POSTS

A couple other possibilities are worn or loose wheel bearings. This causes brake pedal drop because when the wheel rotates it pushes the piston in the caliper in and then you have to pump pedal to get piston back out, another possibility is a stuck caliper slide, a caliper that is frozen will need to be pumped to compensate for the frozen part. Its got to be one of these