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Need brake help

Nwcharger

NAXJA Forum User
Location
Eatonville
Ok so first of all yes I have done numerous searches for this and I cannot find anything that is the same issue I am having. I replaced the brake hardware in my rear drum brakes yesterday and the wheel cylinders. while doing this I twisted and broke a brake line. went to the store got a new line and installed it. when I went to bleed brakes I realized I had let the master cylinder go dry. I removed the MC and bench bled it. re-installed and started by gravity bleeding the lines. Then went to pressure bleeding. Pedal still goes down to almost floor before it stops. It is firm there but goes way down. Is not getting stiffer with bleeding. It is a 1992 xj with abs. I have seen some things about a code reader to bleed the abs pump? I am at the end of my rope. Its driving me nuts. any help appreciated.
 
This for a 93 if you have a Bendix ABS system disregard.


NOTE: Use only DOT 3 brake fluid from a sealed container. DO NOT
use DOT 5 silicone brake fluid.
1) Ensure ignition is off. Clean master cylinder reservoir
cover and surrounding area. Ensure reservoir is full. Bleeding
sequence is master cylinder, Hydraulic Control Unit (HCU) valve body
(at fluid lines), right rear wheel, left rear wheel, right front wheel
and left front wheel.
2) After bleeding master cylinder, position shop towel below
4 hydraulic control unit brakelines. Using flare wrench, slightly open
hydraulic control unit brakeline fittings individually.
3) DO NOT allow brake fluid to contact paint or electrical
connectors. Slowly depress brake pedal. Close hydraulic control unit
brake pipe fitting and release brake pedal. Repeat process until no
air escapes from brake pipe fitting. Repeat procedure for remaining 3
brakelines.
4) Ensure master cylinder reservoir is full. Raise and
support vehicle. Bleed all 4 wheel calipers. Attach a clear hose to
right rear caliper bleeder valve and submerge other end of hose in
container of brake fluid.
NOTE: DO NOT pump brake pedal while bleeding brakes. Pumping brake
pedal compresses air into tiny bubbles throughout system
making bleeding more difficult.
5) Open bleeder valve. Slowly depress brake pedal. Close
bleeder valve and release brake pedal. Wait 5 seconds. Repeat process
until no air bubbles are seen from hose. Tap lightly on
cylinder/caliper housing to free trapped air. Close bleeder valve.
Repeat process until no air bubbles are seen from hose. Repeat
procedure on left rear, right front and left front bleeder valves.
Ensure reservoir is full.
6) Using DRB-II, follow prompts and perform BLEED BRAKES
procedure. After performing BLEED BRAKES procedure using DRB-II,
repeat steps 1)-5). Ensure master cylinder reservoir is full.
 
Where is the hydraulic control unit? is that the aluminum rectangular block that the lines go into after the abs pump? I had the master cylinder replaced today. Brakes re pressure bled and still am not getting a stiff pedal till almost to the floor. I have heard I might need to have them bled using a power bleeder at the MC or the DRB II scan bleed.
 
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