Update on thread 63515 ABS Failure on LC100
Submitted: Tuesday, Jun 16, 2009 at 20:59
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Member - Bob & Lorraine S (NSW
The final outcome was that Toyota found that the ABS module part nbr 89540-60400 located under the dash was damaged by the failure of the master cylinder/pump/accumulator part nbr 47210-60013
Both units replaced and ABS now ops normally
Reply By: Flywest - Wednesday, Jun 17, 2009 at 00:20
Wednesday, Jun 17, 2009 at 00:20
Bob,
Its just possible that someone who replaced break pads on your vehicle and didn't realise it is abs equipped cased the damage to the abs components.
In older cruisers without abs - theres a common used technoque of swinging the caliper up - and using a G cramp to firce the cylinder/s in the caliper BACK into theirhousing sufficient to allow the extra travel room for NEW break pads to fit over the disc rotor. It basically pushes the fluid back past the masster cylinder into the fluid reservoir - and negates the need to "bleed" the brake lines afterward.
With ABS equipped vehicles - you can't do this G crapm technique without damaging the ABS components you mention.
On ABS equipped vehicles, you must release the bleed nipple on the caliper to allow fluid to be expelled - then re bleed afterwards - to get the brake pedal back up.
If a mechanic familiar with the old technique used it on your ABS equipped vehicle - it is quite likely that the damage was thus caused.
Bit of a trap for wary players with the newer ABS equipped vehicles.
It's a common used timesaver for lazy mechanics to do it that way to save the time required to bleed the break lines after fitting new pads on older vehicles.
They may still charge the time out as tho bleeding was done when in effect they use this shortcut to save the time and effort.
Hopefully that wasn;t the case with yours but - its handy to know IF that was the cauise!
Cheers
AnswerID:
370441
Follow Up By: landseka - Wednesday, Jun 17, 2009 at 09:04
Wednesday, Jun 17, 2009 at 09:04
I totally agree there, I had this exact situation 2 years ago on the east coast.
The 80 Series was booked for new pads, got a call from mechanic to say that he couldn't get a "pedal" so the master cylinder was replaced.
Next day coming down the
hill into
Merimbula (with
T Junction at the bottom for those that don't know) with 18' van in tow the pedal went to the floor.
Luckily I had changed the auto down to 2nd at the top of the
hill and was able to avoid tragedy by using the van brake manually.
It turned out to be the ABS unit had died. New price $3000 and none in Australia. With some phoning we found a 2nd hand one for $800 and we were on our way a week later.
RACWA paid for a week in the van park plus a hire car for the duration, can't complain about that. The workshop paid for the ABS unit and fitting.
A lesson learned there the hard way.
Regards
Neil.
FollowupID:
637776
Follow Up By: nowimnumberone - Wednesday, Jun 17, 2009 at 18:05
Wednesday, Jun 17, 2009 at 18:05
i disagree with flywest
as far as know the only vehicle to have problems with abs if you use a g cllamp to push back the piston is curent model pajero.
we use a g clamp on everything 80s 100s gus prados etc and never had a problem yet
ps the we flush and bleed system afterwards
cheers
FollowupID:
637853
Follow Up By: Flywest - Thursday, Jun 18, 2009 at 01:24
Thursday, Jun 18, 2009 at 01:24
We use the G clamp on the No. 1 sons early 80 series, pre abs - but the 2nd sons 2007 advetura - no way - it CAN damage the ABS unit forcing fluid back past the master cylinder and ABS unit, so use the bleed system....to change pads on that vehicle.
Thats what the bro In law whose a mechanic advised. Its worked fine so far doing them that way.
Others mileage may vary.
Cheers
FollowupID:
637926