Well I got the master cylinder/abs unit taken out and stripped down yesterday.
The shuttle/control valve for the high pressure was stuck as we though. There was lots of contamination and debris in there too, perhaps from too infrequent brake fluid changes? The actuator side of things, I cleaned and flushed out. Free'd up the sticking valve. The lever that moves the cylinder, which is on a ball joint, pivoted from the underneath of the inspection plug was also bent. Presumably from the valve being stuck and the pedal being pressed, so I straightened that out too.
I made a start on the actual ABS valve block too. Lots of crud under the black cover. Rusty looking solenoid valves. Hopefully they are OK. The ribbon cable doesn't look good either, I haven't got continuity to two of the valves, so I will rewire them all and do away with the ribbon completely.
As you can see by how dark the photos are, I was running out of light. I'll try to get out there today to finish up the ABS valve block.
Going to have to go to the local hydraulic supply place and try to get some 'O' rings too for reassembling the control valve assembly into the actuator block. One was pretty much destroyed in it's removal unfortunately.
I read on the Jaguar forums that Jaguar had a service bulletin stating that upon changing pads, open the bleed nipple on the caliper before pushing the pistons back to prevent any 'bad' fluid from being pushed back into the ABS system. Might be worth doing this on our cars in the future!
The shuttle/control valve for the high pressure was stuck as we though. There was lots of contamination and debris in there too, perhaps from too infrequent brake fluid changes? The actuator side of things, I cleaned and flushed out. Free'd up the sticking valve. The lever that moves the cylinder, which is on a ball joint, pivoted from the underneath of the inspection plug was also bent. Presumably from the valve being stuck and the pedal being pressed, so I straightened that out too.
I made a start on the actual ABS valve block too. Lots of crud under the black cover. Rusty looking solenoid valves. Hopefully they are OK. The ribbon cable doesn't look good either, I haven't got continuity to two of the valves, so I will rewire them all and do away with the ribbon completely.
As you can see by how dark the photos are, I was running out of light. I'll try to get out there today to finish up the ABS valve block.
Going to have to go to the local hydraulic supply place and try to get some 'O' rings too for reassembling the control valve assembly into the actuator block. One was pretty much destroyed in it's removal unfortunately.
I read on the Jaguar forums that Jaguar had a service bulletin stating that upon changing pads, open the bleed nipple on the caliper before pushing the pistons back to prevent any 'bad' fluid from being pushed back into the ABS system. Might be worth doing this on our cars in the future!
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