I have an 08 TRD Sport, 6pd. I bought it back in February and since it was obviously cold at the time, I noticed that when i parked it for awhile (overnight or for the hours i was at work) that when i came back to the truck, i would put my foot on the brake and it would feel extremely stiff. Not wanting to blow a line i wouldnt put excessive pressure on it. When i pushed in the clutch to start the engine, the truck would roll if i was on any sort of incline. As soon as the truck started though i would feel the brakes come back to life and work completely fine. Then, once the weather warmed up, no problems at all. Now that we have had a few colder days, its happening again. I had the dealer "check" them when i first noticed the problem and have scheduled an appointment again but i was wondering if anyone either A. experienced this also and B. has any idea what is causing this.
The brakes are power assisted when the engine is running. You might try using the parking brake, which is a direct cable to an additional set of calipers on the rear rotors.
__________________ 2008 Tundra Crew Max Limited 4x4 5.7L Sunroof 20" Wheels Skid Plate Enhancement XM Anodized Aluminum 'T' Shifter Stebel Nautilus 110dB Compact Air Horn Air Lift LoadLifter 5000 Air Springs
Hey d'lo. I agree this would be the most simple solution but obviously there is a problem since this only happens during cold weather. This is something that I have never experienced with any stick shifts I have owned or operated. Having always "parked" leaving the transmission in either 1st or reverse without the use of the hand brake (unless on a steeper grade).
Hey d'lo. I agree this would be the most simple solution but obviously there is a problem since this only happens during cold weather. This is something that I have never experienced with any stick shifts I have owned or operated. Having always "parked" leaving the transmission in either 1st or reverse without the use of the hand brake (unless on a steeper grade).
I don't know that there is a problem. Depending on how cold the weather is, the brake fluid could probably change substantially in viscocity, leading to the pedal feeling stiffer than in warm weather.
I agree with the above post that (within reason) you are not going to blow a line with foot pressure.
Also, I'd recommend 2nd over 1st for parking. 1st gear is low enough in gear ratio that you can turn over the engine if you're on a steep enough grade and don't have sufficient stoppage from the parking brake. I don't know if the Tundra has a system to prevent this, but I experienced it in my old Taco and a Rabbit I drove in high school.
__________________ 2008 Tundra Crew Max Limited 4x4 5.7L Sunroof 20" Wheels Skid Plate Enhancement XM Anodized Aluminum 'T' Shifter Stebel Nautilus 110dB Compact Air Horn Air Lift LoadLifter 5000 Air Springs
I had the same problem with my 06 the first winter i had it. I had to use both feet on the pedal to keep from rolling backwards out my driveway every morning.. the pressure bleed was approx. 7 hours until it was solid as a rock again. again this only happened when it was cold out, so there has to be some kind of corrolation.
my dealer replaced my mastercylinder , and so far there has been no problems, however, this summer we went on vacation for one week and when we got back, the pedal was very firm again, but still not rock solid as the original problem.
good luck, this was a serious safety isssue for me and my kids as the first time we experienced this , we were rolling backwards into traffic and couldnt stop. we almost bit the big one.
hoytoyota, did your brakes function normally after the truck was started? What happens with mine is that i would push the brake then the clutch i would possible role if i wasn't holding the brake hard enough (on the days where it was stiff) but as soon as the engine was running, the brakes would go back to normal almost instantly.
Sounds like a defective brake booster/master cylinder assembly. Check to see if the vacuum reserve functions properly when the truck is turned off. You should be able to push the brake pedal 3 times with reserve boost, with each successive time less than the other. If there is no change in distance between each time, the booster check valve is defective and air tightness is compromised. Also check the booster under load. With the engine running, press the brake pedal with normal force, hold it there, and shut off the engine. The pedal should not rise or fall for 30 seconds.
A super firm pedal tells me that all remaining vacuum has left the brake booster when you go to start it. This gives you that unassisted firm pedal feel.
And trust me, you'll never be able to put as much force on the lines as the brake booster can.
blackdeek2006 yes , as soon as i started the engine the brakes had power to operate as normal and the pedal returned to normal feel. I actually thought maybe my wife pumped the brakes 50 times with the engine off, just to screw with me, the first time it happened..... started a fight I had to apologize for later.... LOL
Thanks for the responses guys. I brought my truck in for its 15k oil change and had them look at the brakes again and they couldn't find anything wrong (big surprise) so the service department is calling in the field tech from Toyota. So i'll drop it off the night before so he can check it first thing in the morning and hopefully mimic what i've been experiencing. I'll also give them this info to help them diagnose the issue and fix it this time.
2008 Brake Issue/Problem
Linear Mode
