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After routine disc brake pad change on 1999 Sienna, new ones on front left were gone completely in 2 months. (Had also noticed much heating of same wheel, but I was not the principle driver.) Upon new replacement, found fluid would not pass either direction: neither master to caliper, nor caliper to master (discovered by having to open bleed valve to retract piston in caliper). From then on front left brake just did not function--cold all the time; of course pulling to right some. ABS light never on through all this, until I pulled the fuse so it wouldn't slow action on front right, which had caused some scary stops. Finally learned how to read codes form T1 in engine compartment. Reinstalled fuse. Got old code for LF speed sensor. I knew the connector plug top of wheel well had been spliced once, carefully redid splice, checked voltage, ran it around, now NO codes. Apparently the spliced sensor had been OK, but figured it could have contributed at some past time to the fluid blockage. Took it for a drive on gravel road to activate ABS in hopes of loosening the blockage. But realized after several gyrations that I could not activate the LF because the brake didn't work, so the wheel wouldn't skid. Had loosened left front line at ABS unit to check if the fluid blockage might be elsewhere, but no, it's in the ABS unit. I am guessing the stuck valve is a mechanical problem since I'm getting no codes or ABS light. (Unfortunately I might have set myself up for it by forcing fluid from the caliper back through the system on the first change; learned only later that that is not good to do when retracting the piston's.)
Any thoughts, suggestions on my analysis? Or methods of activating that LF valve on the ABS, either by physically simulating a skid, or what diagnostic tool will do it? Thanks, birdseed
Any thoughts, suggestions on my analysis? Or methods of activating that LF valve on the ABS, either by physically simulating a skid, or what diagnostic tool will do it? Thanks, birdseed
