Just replaced Master cylinder in van, 1 1/2 weeks later brake petal down to floor, no pressure. back to garage, Master cylinder faulty, new one installed. 1 week later, same thing happend, no pressure. Back to the garage, they found no leak in Master Cylinder, Bleed the lines again. 1 week later again, same thing. back to garage, bleed brakes.
Well, 2 days later, same thing. HELP. The arage is at a loss. Has anyone else experienced the same thing? Any help would be appreciated.
Did your mechanic use a DRB III or equivalent scanner before performing the bleeding procedure after installing the master cylinder? This is a requirement by the manufacturer (Chrysler) when bleeding the brake system.
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Your clutch fluid reservoir may need brake fluid-yes, it uses brake fluid as a hydraulic fluid. Check reservoir on the firewall. It will sit beside the brake master cylinder. The reservoir sits atop the clutch master cylinder. If it was dry, the clutch may need bleeding down at the slave cylinder on the transmission housing-where the clutch fork sticks out of the transaxle.. Open the bleed valve on the slave cylinder, and have someone slowly press clutch down. Keep bleeding until a steady stream of fluid comes out when clutch is pressed. Then close bleed valve, check clutch operation-pedal should have some pressure on it now.
its sounds like it could be a bad master cylinder with an internal leak.it could also be a problem with the abs hydraulic module that for some reason is bypassing brake fluid within the unit itself.these problems won`t neccessarily turn on the dash light or activate the abs light.
if it is the wheel cylinder that is leaking then it will have to be replaced and all the components cleaned with brake cleaner.depending how badly soaked the brake shoes are you may have to replace them also.you may have to heat the brake line that connects to the wheel cylinder,or even replace the line if it gets damaged.the bleed all the air out of the system,
If the fluid level is staying constant then it sounds like the brake master cylinder or the master cylinder booster. If the seals are bad on the master cylinder the piston just goes through the fluid. Many boosters use air pressure to assist in the braking proces and it could have a leak.
you need to lay on your back and follow the brake pedal up so far and you will see the brake switch attached to it,you will need to pull out a large hair pin clip,and wiggle the master cylinder rod and the switch off together,
Did you bench bleed the master before you installed it???? Engine off, have someone push the brake petal down and hold it down while you crack the brake line loose at the master,then tighten it and let up on the petal.Do this several times for each of the 2 lines at the master, only cracking it when the petal is being held all the way down.Repeat...Do them separately.Have some rags below the master to mop up the mess and keep the master from running out of fluid. Then do the gravity bleed one more time on each wheel cyl. and watch for a bubble of 2.
I hope this helps you.
Yes the booster sounds fine.
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.
ITS THE MASTER CYLINDER AGAIN.More than likely they are using a re manufactured master cylinders. Get a new one from MOPAR-(CHRYSLER) that will take care of your problem. Trust me I have had the same problem with a similar vehicle in the past in my shop. Good Luck, thank for using FIX YA
My 03 trailblazer does the same thing and the service dept. told me that it was normal for this model to do that, it has never failed to stop but if your sitting at a red light you can feel the peddle go down to almost the floor but it stops fine and it has done this since day 1 and they say thats normal on the trailblazer.