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Toyota Avalon Brakes, ABS, VSC, etc.

151 messages,  Last post on Nov 24, 2009 at 6:06 AM

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#142 of 151 Re: ABS Failure -- Pedal to Floor [Mr_Shiftright] by wwest Mar 03, 2009 (10:10 am)
Replying to: Mr_Shiftright (Mar 03, 2009 9:52 am) 100% sure..??   No, NEVER.   The problem could also have been a bit of debris blocking one of the ABS fluid pressure solenoid relief valves open slightly. Debris "washed" away, nothing for the techies to find wrong with the ABS.   But my experience has been that an ABS failure light indication is often the very first indication that I need to replace a failing 12 volt battery. The ABS pumpmotor self-test puts a VERY heavy load on the 12 volt power source and distribution system and if the battery is even slightly marginal.....
#143 of 151 Re: ABS Failure -- Pedal to Floor [mermidon] by fin Mar 03, 2009 (5:15 pm)
Replying to: mermidon (Mar 02, 2009 1:05 pm) You have answered your own question: ...but instead confirmed that the ABS system was working as intended. They also ran diagnostics, which showed that no ABS failure code was recorded in the system.   So, it was working as intended and it failed..but... it passed! This example is more proof that modern auto electronic systems are simply far too complicated. Scary trip. This should not happen in a modern sedan.   But then, you never lost control of the car. An ABS working well gives you control as the wheels don't lock. Same for skid control. You might not stop but you go where you steer. These systems generally override any manual input. The sinking pedal allows this to happen within the systems therefore no error code. Probably.   It may be as *wwest* has described it above. Electrical current is critical to the modern auto. A voltage drop could slow the response time and maybe still not show an error. In any case, you are along for the ride. This might happen in any ABS/VSC car depending on the system settings, electronics, etc. ....Where is my 1959 Buick......? Replies to this message: wwest (Mar 04, 2009 5:54 am)
#144 of 151 Re: ABS Failure -- Pedal to Floor [fin] by wwest Mar 04, 2009 (5:54 am)
Replying to: fin (Mar 03, 2009 5:15 pm) "...Where is my 1959 Buick....?"   Either in the junk yard or already melted down as scrap..   Exactly where it should be.   The way I remember it cars of that era were more prone to brake pedal "fade" for a myriad of reasons. Blown master cylinder seal being the most common but not far above on eof the 4 brake shoe pistons.
#145 of 151 Re: ABS Failure -- Pedal to Floor [mermidon] by amauhry Mar 04, 2009 (10:58 am)
Replying to: mermidon (Mar 02, 2009 1:05 pm) But my experience has been that an ABS failure light indication is often the very first indication that I need to replace a failing 12 volt battery   As wwest indirectly pointed out, if the system is over/short of voltage for whatever reason you should get a MIL in the dash along with a trouble code stored in memory. A MIL and corresponding DTC should appear for any abnormalities in the system (ABS, EBD, BA, VSC, etc.). What happened to “mermidon” was completely out of wack, especially for the fact that the tests done by the mechanic showed no symptoms at all. mermidon didn’t mention, however, if he noticed any warning beeps and/or lights in the dash just prior to the incident.   My two cents: pay attention to the dash when starting your car. If any of the brake system icons don’t clear a couple of second after ignition, leave your car where it is and jump out of there!   Amaury '08 Limited Replies to this message: wwest (Mar 05, 2009 7:31 am)
#146 of 151 Re: ABS Failure -- Pedal to Floor [amauhry] by wwest Mar 05, 2009 (7:31 am)
Replying to: amauhry (Mar 04, 2009 10:58 am) MIL and/or CEL is reserved for engine problems/emisisons.   ABS/EBD/VSC/etc will not cause an MIL.
#148 of 151 '02 Avalon by superfireman Nov 13, 2009 (6:21 pm)
New front pads, rotors, calipers and rear pads. This after the RF caliper locked-up on us during a trip. Did all the work myself. Now the brake pedal travels to far and is too soft. So I bleed the brakes RR LR RF LF. I did this 4 times, and went through 2 large bottles of fluid. Still have the same brake softness and pedal travel. Funny thing is...I noticed that if I pump my brakes once... the brakes work perfectly. If I just apply them as I should, the pedal travels too far and the brakes are soft. 120k on the car and it has ABS and toyota's version of traction control, forgive me I don't remember the acronym...lol. System has been checked for leaks and the power booster is holding air pressure as it should... Any thoughts on how to get my brakes back to normal???   Thanks!!! Replies to this message: fin (Nov 13, 2009 9:06 pm) wwest (Nov 16, 2009 12:39 pm)
#149 of 151 Re: '02 Avalon [superfireman] by fin Nov 13, 2009 (9:06 pm)
Replying to: superfireman (Nov 13, 2009 6:21 pm) Not sure about the wheel sequence for bleeding air and otherwise purging the lines but the problem sounds like air is still trapped in the system. Air can be compressed, liquid cannot, so when you apply the pedal you are simply compressing the air and the brake does not function as designed. Make sure the master cylinder is always full and always close the cylinder bleed valve with pressure applied. Another possibility is a failing master cylinder. Hope this helps, others may have more ideas..
#150 of 151 Re: '02 Avalon [superfireman] by wwest Nov 16, 2009 (12:39 pm)
Replying to: superfireman (Nov 13, 2009 6:21 pm) There is usually an additional bleed valve on or near the ABS pumpmotor assembly/manifold.
#151 of 151 1998 Toyota Avalon by freweight Nov 24, 2009 (6:06 am)
I have a 1998 toyota avalon with 151,000 miles on it. MY ABS light comes on after the driving the car for about 5 minutes. The TRAC light also begins to flash at about 1.5 second intervals. I took the car to a toyota dealership, They indicated that the actuator needed replacing at a cost of $1300. I asked for the diagnostics. They indicated that the car is throwing codes 21 -24 as well as 43. I kinda sensed that the technican was guesssing. I can't explain why but he did nto seem committed to his diagnosis. has anyone else had similar issues and if so, were you told that the actuator need replacement?   Any help would be most appreciated :   Shawne">

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