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2005 scion TC, brake problems
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fiberglasslvr
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Sep 10, 2011, 5:33 PM
Post #1 of 10
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2005 scion TC, brake problems
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so here is the problem, I have a 2005 scion TC, with 80,000 miles and at the end of the brake cycle weither coming from 60 mph or 25mph. the brakes skip and i can feel the pedal vibrate and the car slips forward and emmits something like an error sound. and then catches right after it only slips for a second. but is quite scary. i have had it in various shops since nothing comes up on the scanners they say that they cant find anything wrong.
any info on this issue would be greatly appreciated
thanks in advance.
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Discretesignals
Ultimate Carjunky
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Sep 10, 2011, 5:41 PM
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Re: 2005 scion TC, brake problems
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What speed do you feel the "error occur? Does it happen right before you come to a stop? Does it happen in parking lot maneuvers? Does it happen in random places? What is the road condition like when this happens?
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Sep 10, 2011, 5:42 PM)
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fiberglasslvr
Novice
Sep 10, 2011, 5:46 PM
Post #3 of 10
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Re: 2005 scion TC, brake problems
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It happens in pretty much all driving conditions, and it is right before you come to a complete stop.
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Discretesignals
Ultimate Carjunky
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Sep 10, 2011, 5:58 PM
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Re: 2005 scion TC, brake problems
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From your description is appears the ABS system is activating right before you come to a stop. The ABS system uses speed sensors at the wheels to monitor the wheel speeds. The shop needs to monitor the wheel speed sensor inputs with a scan tool or oscilloscope to see if you have any erratic readings at slower speeds. Has there been any work done to the vehicle?
The wheel speed sensor's signal strength is affected by the gap between the sensor and the tone ring in the wheel bearing housing. If that distance is changed from rust jacking of the sensor, that will cause slow speed ABS activation.
Inspect all your wheel speed sensors for rust jacking.
Rust jacking means the sensor is being raised off the mounting hole by corrosion which changes the air gap.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Sep 10, 2011, 6:00 PM)
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fiberglasslvr
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Sep 10, 2011, 7:32 PM
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Re: 2005 scion TC, brake problems
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recently had new rotors installed and a front right wheel bearing. before the wheel bearing was installed the issue only occured sparratically. now it happens on every breaking cycle.
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Discretesignals
Ultimate Carjunky
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Sep 10, 2011, 7:43 PM
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Re: 2005 scion TC, brake problems
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You should still inspect those sensors for rust jacking. If there is a lot of rust where the sensors mount, you should remove the sensors, put something in the hole to keep trash from getting in there and clean the rust off around the sensor mount. Re-install the sensors. See if that solves your problem.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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fiberglasslvr
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Sep 10, 2011, 7:46 PM
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Re: 2005 scion TC, brake problems
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ill try that thanks for all your help, and ill be letting you know what happens.
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Discretesignals
Ultimate Carjunky
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Sep 10, 2011, 8:07 PM
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Re: 2005 scion TC, brake problems
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Usually the front sensors would be the ones that would rust jack. The tone rings are actually on the CV axles and the sensor slides through a mounting hole in the knuckle. The rear sensors aren't really prone for that because the sensor is part of a cap on the hub bearings.
Let us know how things turn out.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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fiberglasslvr
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Sep 13, 2011, 1:35 PM
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Re: 2005 scion TC, brake problems
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so i had the problem before and after the jobs were done, the work was done by a mechanic but not at the dealership. fluid levels seem good, they also said that they bled the brakes, but that is somthing i can always check again. as far as the wheel speed sensor, is that something i can do or is that something i have to get done, it doesnt look very difficult in the front wheels, but i dont know about the back.
and by the way.
thanks for all the help guys
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Discretesignals
Ultimate Carjunky
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Sep 13, 2011, 7:47 PM
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Re: 2005 scion TC, brake problems
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If you have a set of jack stands and a jack along with maybe a 10mm or 8mm wrench/socket and a wire brush, you could probably tackle the job yourself.
You'll have to take the tire off and then look at the sensor. If it is really rusty there around the sensor, remove the sensor and clean the area with your wire bush where the sensor mounts. Also make sure no rust is stuck on the bottom or mounting surface of the sensor itself. Once the sensor's mounting surface is free of rust, blow out the screw hole and re-install the sensor and torque the bolt to 80 inch pounds.
Don't clean the rear ones because they are pressed into the wheel bearing hub.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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