Braking issue...
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Amateur
Joined: Jan 2004
Posts: 31
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Braking issue...
Alright, let's start at the beginning. LOL a few months ago, I totally re-plumbed the rear brakes on my 91 Dakota, (4X4, 5.2l, 210,000mi) anyway, after completion, and a total brake bleed, I was unable to get the sponginess out of the pedal. After several bleeds and a new master cylinder, I still have the same issue. After getting all the bubbles out, I can hear a squeak/squish sound in the rear abs unit. Is there a special bleeding procedure I am not following. I have tried RR,LR,ABS unit, FR,FL to no avail. and ABSunit, RR, LR, FR, FL and still no success. what am I doing wrong... ABS light/ brake light come on when applying more pressure during braking and goes off during initial braking. SPONGINESS is still there.. any IDEAS
Veteran
Joined: Jul 2009
Posts: 447
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Here is what the FSM has to say.
RWAL SYSTEM MANUAL BRAKE BLEEDING
PROCEDURE
(1) If master cylinder has been overhauled or a
new cylinder will be installed, bleed cylinder on
bench before installation. This shortens bleed time
and ensures proper cylinder operation.
(2) Wipe master cylinder reservoir and filler caps
clean with shop towels. Use Mopar brake cleaner if
exterior of reservoir and filler caps are extremely
dirty.
(3) Remove reservoir filler caps and fill reservoir
with Mopar, or equivalent quality DOT 3 brake fluid.
(4) If calipers, or wheel cylinders were overhauled,
open all caliper and wheel cylinder bleed screws.
Then close each bleed screw as fluid starts to drip
from it. Top off master cylinder reservoir once more
before proceeding.
(5) Recommended brake bleeding sequence is:
² master cylinder
² combination valve
² rear antilock valve
² right rear wheel
² left rear wheel
² right front wheel
² left front wheel
(6) Bleed master cylinder first, combination valve
second, and RWAL valve third. Bleed cylinder and
valves at brakeline fittings one at a time. Procedure
is as follows:
(a) Loosen brakeline fitting (or caliper/wheel cylinder
bleed fitting) 1/2 to 3/4 turn.
(b) Have helper press and hold brake pedal to
floor. Observe fluid stream from fitting, or bleed
screw.
(c) Tighten bleed fitting and have helper release
brake pedal. Be sure to tighten fitting or bleed
screw before releasing brake pedal.
(d) Repeat bleeding operation until fluid exiting
fitting (or bleed screw), is clear and free of bubbles.
(7) Bleed first wheel brake unit. Start at left rear
wheel and follow sequence recommended in step (6).
Repeat bleeding operation at each wheel until fluid
exiting bleed screw is clear and free of bubbles.
(8) Top off master cylinder and verify proper brake
operation before moving vehicle.
PROCEDURE
(1) If master cylinder has been overhauled or a
new cylinder will be installed, bleed cylinder on
bench before installation. This shortens bleed time
and ensures proper cylinder operation.
(2) Wipe master cylinder reservoir and filler caps
clean with shop towels. Use Mopar brake cleaner if
exterior of reservoir and filler caps are extremely
dirty.
(3) Remove reservoir filler caps and fill reservoir
with Mopar, or equivalent quality DOT 3 brake fluid.
(4) If calipers, or wheel cylinders were overhauled,
open all caliper and wheel cylinder bleed screws.
Then close each bleed screw as fluid starts to drip
from it. Top off master cylinder reservoir once more
before proceeding.
(5) Recommended brake bleeding sequence is:
² master cylinder
² combination valve
² rear antilock valve
² right rear wheel
² left rear wheel
² right front wheel
² left front wheel
(6) Bleed master cylinder first, combination valve
second, and RWAL valve third. Bleed cylinder and
valves at brakeline fittings one at a time. Procedure
is as follows:
(a) Loosen brakeline fitting (or caliper/wheel cylinder
bleed fitting) 1/2 to 3/4 turn.
(b) Have helper press and hold brake pedal to
floor. Observe fluid stream from fitting, or bleed
screw.
(c) Tighten bleed fitting and have helper release
brake pedal. Be sure to tighten fitting or bleed
screw before releasing brake pedal.
(d) Repeat bleeding operation until fluid exiting
fitting (or bleed screw), is clear and free of bubbles.
(7) Bleed first wheel brake unit. Start at left rear
wheel and follow sequence recommended in step (6).
Repeat bleeding operation at each wheel until fluid
exiting bleed screw is clear and free of bubbles.
(8) Top off master cylinder and verify proper brake
operation before moving vehicle.
