Stiff brake pedal after sitting for awhile?
#1
Stiff brake pedal after sitting for awhile?
Never had this problem until this week. Last changed brake fluid ~5000 miles ago. 2011 ISF, ~29k miles.
After letting the car sit for 10+ minutes after driving, I notice the brake pedal is really stiff. As if I had pumped the brake pedal a few times with the engine off. Because of this, I have to really press down hard on the brake pedal in order to start the car or else the warning will say, "depress brake pedal before starting" or something like that.
When I start the car, the brake pedal goes down a little, and it feels "normal" as it always has for the past 20k miles. The brake fluid level is completely level and I don't see any leaks at the master cylinder or at the bleeder valves. Brake performance and pedal feel is normal when driving and I doubt there is air in the system as this didn't occur until this week, and the pedal doesn't slowly sink down when I am sitting at a stop.
Just wondering what could cause this, which does not seem normal?
Thanks for anyone's input.
After letting the car sit for 10+ minutes after driving, I notice the brake pedal is really stiff. As if I had pumped the brake pedal a few times with the engine off. Because of this, I have to really press down hard on the brake pedal in order to start the car or else the warning will say, "depress brake pedal before starting" or something like that.
When I start the car, the brake pedal goes down a little, and it feels "normal" as it always has for the past 20k miles. The brake fluid level is completely level and I don't see any leaks at the master cylinder or at the bleeder valves. Brake performance and pedal feel is normal when driving and I doubt there is air in the system as this didn't occur until this week, and the pedal doesn't slowly sink down when I am sitting at a stop.
Just wondering what could cause this, which does not seem normal?
Thanks for anyone's input.
#2
So this is the first time you've seen this in 20k or so miles?
I've had the stiff brake at start up if the car was not driven for a day or longer. It's always been like this since I purchased it new so I thought it was normal.
I've had the stiff brake at start up if the car was not driven for a day or longer. It's always been like this since I purchased it new so I thought it was normal.
#6
Pole Position
iTrader: (10)
I just parked for about 30 minutes, the first pump of the brakes is normal for me. The next consecutive ones make it stiff.
the pedal should be soft enough so that you don't have to plant your weight on it to start the car. It should be like a standard stop. If it's stiff before ignition, maybe the vacuum pressure in the brake booster leaked out as Lou pointed out.
the pedal should be soft enough so that you don't have to plant your weight on it to start the car. It should be like a standard stop. If it's stiff before ignition, maybe the vacuum pressure in the brake booster leaked out as Lou pointed out.
#7
Instructor
It's also a know issue with the Is 250 and 350s. I have had this issue for a while. I purchased a new booster check valve and gasket, but haven't installed it yet.
Trending Topics
Thread
Thread Starter
Forum
Replies
Last Post
donkiboy
GS - 4th Gen (2013-2020)
42
07-02-24 04:37 PM
LexusFan2
ES - 5th Gen (2007-2012)
13
10-06-22 05:27 PM