Renate,
I am not quite sure why they should have failed you on the load
sensing proportioning and by-pass valve? If it were disconnected or
removed altogether it would not count, would it?
I wouldn't bother with a new valve assembly, unless it's completely
corroded. The repair kit will probably do the job. Setting the valve
requires two pressure gauges connected to the brake cicruit (one
front, one rear) so it's best left for a garage to do it.
Here's the procedure from the FSM:
CHECK AND ADJUSTMENT OF FLUID
PRESSURE
1. SET REAR AXLE LOAD
Rear axle load (include vehicle weight):
1,150 kg (2,535 Ib)
2. INSTALL LSPV GAUGE (SST) AND BLEED AIR
3. RAISE FRONT BRAKE PRESSURE TO 80 kg/cm2 (1,138
psi, 7,845 kPa) AND CHECK REAR BRAKE PRESSURE
Rear brake pressure:
45 =B1 6 kg/cm2 (640 =B1 85 psi, 4,413 =B1 588 kPa)
HINT: The brake pedal should not be depressed twice
and/or returned while setting to the specified pressure.
Read the value of rear brake pressure two seconds after
adjusting the specified fluid pressure.
4. IF NECESSARY, ADJUST FLUID PRESSURE
(a) Disconnect the No. 2 shackle from the shackle
bracket.
(b) Adjust the length of the No. 2 shackle turning it.
Low pressure =97 Lengthen A
High pressure =97 Shorten A
Initial set: 90 mm (3.54 in.)
Adjusting range: 84 =97 96 mm (3.31 =97 3.78 in.)
HINT: One turn of the No. 2 shackle changes the fluid
pressure about following specification.
1.0 kg/cm2 (14.2 psi, 98.1 kPa)
(c) In the event pressure cannot be adjusted by the No.
2 shackle, raise or lower the valve body.
Low pressure =97 Lower
High pressure =97 Raise
(d) Torque the nuts.
Torque: 130 kg-cm (9 ft-lb, 13 N-m)
(e) Adjust the length of the No. 2 shackle again.
If it cannot be adjusted, inspect the valve housing.
(f) Connect the No.2 shackle to the shackle bracket.
5. IF NECESSARY, CHECK VALVE BODY
(a) Assemble the valve body in the upper most position.
HINT: When the brakes are applied, the piston will move
down about 1 mm (0.04 in.). Even at this time, the piston
should not make contact with or move the load sensing
spring.
(b) In this position, check the rear brake pressure.
kg/cm2
Front brake pressure -10 kg/cm2
Rear brake pressure - 10 kg/cm2
Front brake pressure - 25 kg/cm2
Rear brake pressure - 11.8 - 15.8 kg/cm2
Front brake pressure - 60 kg/cm2
Rear brake pressure - 19 - 26 kg/cm2
If the measured value is not within standard, replace the
valve body.
--
Rgds,
Roman (London, UK)
'92 HDJ80 (auto)
On 8/23/07, Malcolm Bagley <[Email address removed]> wrote:
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