ABS 4 wheel brakes 2004 Ram
#1
ABS 4 wheel brakes 2004 Ram
right rear caliper will not bleed - no brake fluid from bleeder. checked all lines & all are open. reservoir never went dry. no codes from ABS. no abs light on dash. master cylinder is good. gravity bleed the right rear caliper no fluid.
petal is hard when engine is not running, but falls to floor when engine started. truck will stop with petal almost on floor.
took it to auto repair shop and after 2 days, they tell me there is nothing mechanically wrong and ABS module is good.
WTF!
does anybody anybody have an idea of just what is wrong or how to fix!!!!
HELP.
petal is hard when engine is not running, but falls to floor when engine started. truck will stop with petal almost on floor.
took it to auto repair shop and after 2 days, they tell me there is nothing mechanically wrong and ABS module is good.
WTF!
does anybody anybody have an idea of just what is wrong or how to fix!!!!
HELP.
#2
#3
Thanks for the come back!
Here is where I am - right rear caliper is new. The hose from caliper to hard line is new. There is no brake fluid flow to caliper. BTW - this is a 4 wheel ABS on an 04 Laramie.
My thinking is to trace back to the master cylinder to be sure hard line is open - not clogged.
Will update later.
Here is where I am - right rear caliper is new. The hose from caliper to hard line is new. There is no brake fluid flow to caliper. BTW - this is a 4 wheel ABS on an 04 Laramie.
My thinking is to trace back to the master cylinder to be sure hard line is open - not clogged.
Will update later.
#5
#6
Just in case and for thoroughness, going to briefly describe how to bleed properly. You need a helper sitting in the drivers seat to push the pedal while you are under the truck opening/closing the bleed screw. Do this with truck not running.
- Top off the brake fluid reservoir.
- Have the helper push the pedal not real hard but firmly. While the pedal is pressed, open the bleed screw at the right rear calliper. Did the pedal drop to the floor when the bleed was opened? Did any fluid come out? Close the bleed screw before the helper releases the pedal. Repeat; ..... push pedal, open bleed, close bleed, release pedal, .... repeat 20+ times. Check and refill the reservoir frequently. When fluid an no more bubbles come out at the right rear bleed, goto left rear and do same, then front right, finally front left.
Still no fluid at the rear? Only thing to do then is to start taking the line apart joint by joint, checking for pressure and fluid at each disconnect. Start by taking the hose off the calliper, press the pedal and check for pressure or fluid. Follow to next joint top of the rear axle centre, take apart, press pedal, check for pressure or fluid. , .... and so on.
I have read somewhere of problems with the short rubber hose at the end near the callipers sometime deteriorate internally and result in blockage in that rubber hose part. Your post says that has been replaced with new. Mentioning for consideration and checking a possible faulty new hose.
- Top off the brake fluid reservoir.
- Have the helper push the pedal not real hard but firmly. While the pedal is pressed, open the bleed screw at the right rear calliper. Did the pedal drop to the floor when the bleed was opened? Did any fluid come out? Close the bleed screw before the helper releases the pedal. Repeat; ..... push pedal, open bleed, close bleed, release pedal, .... repeat 20+ times. Check and refill the reservoir frequently. When fluid an no more bubbles come out at the right rear bleed, goto left rear and do same, then front right, finally front left.
Still no fluid at the rear? Only thing to do then is to start taking the line apart joint by joint, checking for pressure and fluid at each disconnect. Start by taking the hose off the calliper, press the pedal and check for pressure or fluid. Follow to next joint top of the rear axle centre, take apart, press pedal, check for pressure or fluid. , .... and so on.
I have read somewhere of problems with the short rubber hose at the end near the callipers sometime deteriorate internally and result in blockage in that rubber hose part. Your post says that has been replaced with new. Mentioning for consideration and checking a possible faulty new hose.
Last edited by FaceDeAce; 03-20-2018 at 02:12 AM.
#7
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#8
#9
Most parts stores *should* stock them, or be able to get them next day, if not that afternoon. (depending on what time you go there.)
To get 'em apart..... chemicals are your friend. I clean them good, hit 'em with chems, let 'em soak for a bit, hit 'em again, then use the proper sized line wrench on them. Sometimes, if they are really stubborn, or, the wrench just slips, I will cut the soft line, (assuming I am replacing it.....) use two pair of vice grips, and twist the line off the nut, instead of trying to turn the nut. (and breaking the hard line.....)
To get 'em apart..... chemicals are your friend. I clean them good, hit 'em with chems, let 'em soak for a bit, hit 'em again, then use the proper sized line wrench on them. Sometimes, if they are really stubborn, or, the wrench just slips, I will cut the soft line, (assuming I am replacing it.....) use two pair of vice grips, and twist the line off the nut, instead of trying to turn the nut. (and breaking the hard line.....)
#10