98' MC failure at roughly 160k miles no emergency brakes so that was fun, replaced with the brand new OEM MC Assembly. Tempted about grabbing a higher mile LX just worried about this issue.
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Assuming booster pump has run until it stops, which bring accumulator up to predetermined pressure.I did not have any brake failure, but i had the awful strangling seagull sound and warning lights / buzzer
Bought a brand new MC assembly and had it installed.
No problems since. However, every time i get in my car the brake feel is a little different. Some days the pedal is kind of soft and travels further. Other days it's really firm and brakes great.
Any idea what would cause the inconsistency?
This^^^.Assuming booster pump has run until it stops, which bring accumulator up to predetermined pressure.
Assuming booster pump has running until it stops within 30 to 40 seconds, after pumping pedal 40 time with key off.
Assume no loss of fluid from leaks.
Assuming no flexible lines failing, which may be seen as flexing/expanding/bulging.
I'd flush the fluid.
I did not have any brake failure, but i had the awful strangling seagull sound and warning lights / buzzer
Bought a brand new MC assembly and had it installed.
No problems since. However, every time i get in my car the brake feel is a little different. Some days the pedal is kind of soft and travels further. Other days it's really firm and brakes great.
Any idea what would cause the inconsistency?
@dace voit , I've wondered if the booster timing test not within the 30 to 40 seconds would indicate air in ABS. FSM states re-bleed if not within time frame, which I've assumed would included ABS valves, but I've never been sure.
What your thought on that?
How is Toyota not recalling such a serious issue?
This seems to me to be a TOTALLY different issue. You can check brakes daily, and find no problems, but the MC, pump, etc. can go out for no reason and without warning. I'm not aware that inspection / preventative maintenance addresses these brake issues.Nothing to recall. FSM is very clear inspect brake lines and brakes.
The only time I've seen "Total brake failure" with total fluid loss.This seems to me to be a TOTALLY different issue. You can check brakes daily, and find no problems, but the MC, pump, etc. can go out for no reason and without warning. I'm not aware that inspection / preventative maintenance addresses these brake issues.
I, too, can't understand why Toyota hasn't addressed a problem this serious! If nothing else, at least make the part(s) "affordable" where people are more likely to change out the parts as a preventative measure. I've seriously considered selling my 84 yo mother's '06 LX for this braking reason and for the rare, but known, VGRS "disengagement" issue. Those are two REALLY, REALLY serious issues!
I'm not trying to be argumentative either. It just appears to me that there's enough loss of braking in several of these instances that Toyota should be concerned. There have been a couple of failures in 100s in our club, and the people with whom I've talked said they had NO brakes. As in NO brakes! Others on the forums have reported the same thing or have reported only having brakes for 2 or 3 pumps of the pedal. In a conventional vacuum booster/master cylinder system, I've never heard anyone report that they had NO brakes (well, at least not in the last 50+ years). The pedal may have ended up having no power assist, but they never went away completely. In many instances, that's not the case with our system.The only time I've seen "Total brake failure" with total fluid loss.
Pump loss we loose assist brake pressure, but we've brakes at bottom of pedal. Are they great, no! Is it scary, yes! Can we stop, yes!
I've never seen a master cylinders plunger or seal(s) totally fail, only weep. (Same goes for calipers pistons & seals which all vehicles have). Those yielding mushy brakes and fluid loss. There was a recall for 2005-07 IIRC, but not 100 series. It was a seal failure in master, due to incompatibility with aftermarket fluids. I never saw a report of total loss actually, but I didn't study that aspect.
ABS fails we've brakes just no ABS.
I'm not trying to be argumentative or a smart A**, but what would a recall be for?
Good point.One odd, concerning, and interesting thing about this all - I may have said that earlier, sorry if I did- is that some of the reported cases happened at rather low mileage. So one can't just blame this entirely on normal cumulative wear, it seems.