Question about Toyota Tacoma

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While driving down the road brakes want to stay engaged and not depress

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  • rodonley Dec 10, 2008

    I replaced the front brakes on 1990 celica. Since then the front brakes heat up and lock up and won't release.

  • altona986 Dec 11, 2008

    2001 sienna with same issue, but started happening before, and continues to happen, after replacing calipers, pads, rotors, and bled lines. Front brakes grab slightly, just enough to be felt when you let up on the gas, plus, rotors are always extremely hot, turned to dark blue due to heat. Interesting note, opened bleed valve on caliper and there was no fluid discharge, I would have expected to see some discharge had there been pressure in the line.

    DT

  • phelan_bell Jan 05, 2009

    brakes heat up & engage while driving rodeo isuzu 97

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It could be your master cylinder is pulling a vacuum on the lines. May be an indication of your mc failing or trapped or pocketed air in the lines. Not normal air in the lines, but, air that is trying to get out and as it does it pulls a vacuum. One other thing to look for is your brake calipers staying engaged to a certain degree, this could indicate failing calipers seal, fault brake line or wheel cylinder failure. Check out these things

anaanymous

Posted on Oct 11, 2008

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Is the car equipped with the Automatic Transmission?
If so, read on.
Otherwise skip to the end and answer some questions.

POSSIBLE SCENARIO:
I have observed a condition where my car surges slightly when the torque-converter clutch (TCC) cycles between lock and unlock when driving on an uphill grade.
First some basics and history that will explain why the TCC is used.

Engine, Torque Converter, TCC, and Transmission relationship--
The TCC allows for a solid connection between the engine and transmission which allows the input to the transmission to rotate at the same speed as the engine.
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Find a flat section of road where it is safe to perform the test.
Reach a steady speed and keep the gas pedal depressed with one foot. While observing the tachometer (or listening for an increase in engine RPM), with the other foot depress the brake pedal enough to activate the break light switch but not enough to engage the brakes. When the brake light switch activates, the TCC receives a signal to disengage. With the gas pedal being held steady, release the brake pedal and the engine RPM should decrease when the TCC engages.
Old cars with Automatic Transmissions did not use a TCC. I believe the TCC was put in use in an attempt to increase fuel economy.

MY EXPERIENCE WITH SIMILAR SYMPTOMS
The condition that causes that issue on my car is this:
- A slight uphill grade increases the load on the engine.
The car tends to gradually slow and it is necessary to depress the gas pedal to maintain speed.
- Depressing the throttle pedal (manually, or automatically with cruise control engaged) signals the torque converter clutch to unlock when the load increases slightly. (A more drastic load increase would signal the Transmission to downshift to a lower gear.) The corresponding increase in engine RPM and output is enough to compensate for the reduction in speed. When the vehicle speed, engine RPM, and throttle position stabilize to the point that the TCC will engage and the engine RPM will reduce in correspondence with TCC engagement. Now, if the road conditions have not changed, power output is not enough to maintain vehicle speed. With the increased load caused by full engagement between engine and transmission, and the cycle (surging) repeats itself until the road conditions change.

Does that help?
If not:

QUESTIONS
Please define the symptoms.
What are the road conditions when the surge occurs? (A slight uphill grade?)
What is the frequency of the surge?
Does the engine power output have a noticeable surge?
Is there a speed change related to the surge?
Does the tachometer move up and down with little or no change in vehicle speed?
Are all instrument indication in the normal range?
What else has changed?

Good luck!

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