The vehicle sat for a couple of years.Now when I drive it,every other day the brake pressure builds up and starts to lock up the front calipers.and I have to manually bleed it off.It got so tight today,it blew the booster(for the second time).I've changed the booster,master cylinder.rotors,pads,and calipers.
2007-03-05 09:46:13 · 7 answers · asked by Nyte S 1 in Cars & Transportation ➔ Maintenance & Repairs
update for those who have answered...all lines HAVE been flushed with air and fluid,all are correct parts.The only thing that has not been replaced are the rubber lines...which will be ordered tonight.
2007-03-05 11:20:01 · update #1
As Fordman says, moisture in the lines can heat up and expand causing that pressure.
Since the calipers are new, maybe you need to completely flush the old fluid out.
2007-03-05 09:58:55 · answer #1 · answered by Trump 2020 7 · 0⤊ 0⤋
Depending on the Vehicle - brake fluid {can't} be too full & also IF the wrong booster or master cylinder is installed - there might not be the CORRECT play between the Master cylinder & or Booster - ONE person had the Stoplight switch pushed OR adjusted on the brake pedal so far down that IT kept pressure on the system ! SOME people have even put power steering fluid in the master cylinder which will cause the Brakes to lock up because it makes EVERYTHING rubber Swell !
2007-03-05 10:05:40 · answer #2 · answered by Anonymous · 0⤊ 0⤋
It sounds like the pistons are sticking in the calipers due to corrosion on the piston bores, but if you have new caliper assemblies, that shouldn't happen. If you have to bleed the brake system because of excess fluid, it sounds like the fluid is contaminated or is open to the atmosphere somewhere and is sucking up atmospheric moisture, but that shouldn't happen very fast, and you'd actually lose fluid if that was the case. Blowing the booster sounds like a sign of excess vacuum in the system. Have the vacuum system checked. There's a one-way valve in the line to the booster, but it sounds like too much vacuum to me.
2007-03-05 09:51:22 · answer #3 · answered by mcmustang1992 4 · 0⤊ 0⤋
I would say to replace the rubber hoses. They have a tendency to collapse inside of the hose. If you have to releive pressure by opening the bleeder screw, then the hose is not allowing the brake fluid to return thru the line.
2007-03-05 14:00:57 · answer #4 · answered by hap8983 2 · 1⤊ 0⤋
That is strange. Did you flush the brake lines? You may have some corrosion in the lines from moisture while it sat.
2007-03-05 09:53:54 · answer #5 · answered by Fordman 7 · 0⤊ 0⤋
Replace all the flexible brake hoses on the vehicle and the problem will cease.
2007-03-05 10:13:21 · answer #6 · answered by zskip62 5 · 0⤊ 0⤋
proportioning valve! check it and get back to me.
2007-03-05 10:14:34 · answer #7 · answered by bcre8iv 3 · 1⤊ 0⤋