1973 F250 TRUCK 4X4 BRAKE PEDAL GOING TO THE FLOOR
REPLACED THE MASTER CYLINDER, BLED THE BRAKES. WHEN PUMPING THE BRAKES, THE PEDAL BUILDS UP, WHEN RELEASED AND YOU WAIT FOR 5-10 SECONDS THE PEDAL GOES TO THE FLOOR AGAIN. WHAT COULD POSSIBLY BE THE PROBLEM?
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Re: 1973 F250 TRUCK 4X4 BRAKE PEDAL GOING TO THE FLOOR
Bleed the brakes at all 4 wheels and if that doesn't fix it would not be the fist bad master cylinder that i have had or seen rebuilt master cylinders can be good and bad
first bleed master cylinderon vechicle and then bleed brakes
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When you fixed the brakes, did you take the lid off the master cylinder. I just wonder if you spilled out your brake fluid. The only reason the pedal should go to the floor is if the brake fluid is gone or the master cylinder is not working. Check the fuse. Check the brake fluid level. The pedal only goes to the floor if there is no back pressure in the lines between the master cylinder the lines to the brake pistion on the calipers. Please give me a good ratin and keep me informed.
When you bleed the brakes are you starting with brake furthest from the master cylinder? Also was the master cylinder bench bled? If everything there is okay and you are not getting any air in fluid stream, you could try bleeding the brakes by having some one slowly pump the pedal till it is firm. Then have them let off open first bleeder valve and slowly depress to floor and hold there untol the valve is closed. repeat this at all bleeders. You may want to have car running to do this. Try this and let me know.
Did you bench bleed the master cyl. before installing it? then when you installed the new master, did you bleed all 4 points? If yes, then check all for points for leaking caliper/s and leaking wheel cylinder/s. If the van has ABS, check the valve body for a bleeder screw and see if air bleeds out of it. If you've checked everything twice and did everything right then your new master cyl. may be defective.
have one person in the blazer pumping the brake pedal and then hold to the floor, crack the bleeder then tighten, release pedal, repeat till all air is out one side at a time, if this does not work then your ABS unit is bad witch if u follow your lines from your master cylinder u will find a black box with a motor on it, or the master cylinder itself is bad, it also can cause u to have no pedal, replace the master cylinder first, most likely cheaper.