Brake pedal feel...not smooth
08-18-2007, 08:30 PM
#1
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Thread Starter
Brake pedal feel...not smooth
this is an issue, i started noticing more during the summer. when its cooler out, especially at night, it is not so noticeable.
well, upon pressing/releasing the brake pedal, there is sometimes a slight 'grittiness'(if thats a word). first thing in the morning, it does not happen, takes atleast 20-30 minutes of driving to show...and in most cases, happens in 80+ temps.
its not the feel you get from a warped rotor, or something that is effected by the speed of the car. i can be sitting at a light, softly pushing the pedal, and can feel that its not so smooth.
just wanted to get some advice from you guys. have been to the dealer 2 times for this, and of course..."sorry sir, we cannot duplicate it". maybe an issue with the master cylinder? pads need lube? etc...its just funny how the hotter it is outside, the more noticeable it is. car is bone stock, 14k miles.
thanks for reading!
pete
well, upon pressing/releasing the brake pedal, there is sometimes a slight 'grittiness'(if thats a word). first thing in the morning, it does not happen, takes atleast 20-30 minutes of driving to show...and in most cases, happens in 80+ temps.
its not the feel you get from a warped rotor, or something that is effected by the speed of the car. i can be sitting at a light, softly pushing the pedal, and can feel that its not so smooth.
just wanted to get some advice from you guys. have been to the dealer 2 times for this, and of course..."sorry sir, we cannot duplicate it". maybe an issue with the master cylinder? pads need lube? etc...its just funny how the hotter it is outside, the more noticeable it is. car is bone stock, 14k miles.
thanks for reading!
pete
08-19-2007, 08:34 AM
#3
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Thread Starter
i have. its just so hard to get under there. i've used some silicone grease, didnt do anything. its hard to tell if its in the brake pedal linkage, or if its further down the system.
08-20-2007, 01:45 AM
#5
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During the flush/bleed you will get full pedal travel and that alone may be enough the cure the grittiness.
If you press the brakes twice after driving for a while, does it feel gritty twice or only the first time?
If only the first time it MAY be a piston or sliding pin.
If its twice I would say: pedal linkage or master.
The grittiness isn't the ABS kicking in.. right?
Because that also feels as if you were pressing your foot into a glas bowl filled with glass marbles, or gritti
But it's probably all in your head
If you press the brakes twice after driving for a while, does it feel gritty twice or only the first time?
If only the first time it MAY be a piston or sliding pin.
If its twice I would say: pedal linkage or master.
The grittiness isn't the ABS kicking in.. right?
Because that also feels as if you were pressing your foot into a glas bowl filled with glass marbles, or gritti
But it's probably all in your head
08-20-2007, 07:43 AM
#6
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well, it can happen twice. if i press the pedal as far as i can, with some good force, it might not be so noticeable the next time, but still there. it is a very minor thing. if a bleed were to cure this, do you think a 'gravity bleed' will do just fine? thanks spitfire for the repsonse.
08-20-2007, 10:00 AM
#7
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FISH22 Posted on Aug 20 2007, 05:43 PM
Well... if you want max pedal travel, then no
With a gravity bleed you don't press the pedal.
If its fresh fluid you want, then yes.
Why not do both?
First a pedal stroke (or two) per wheel and then the last bit by gravity?
Just a thought
Keep your eye on the reservoir during this (IOW make sure it doesn't get below minimal).
And.. do not forget, that IF you top it right up after you're done, when changing pads in 1-2 years or so, to drain some fluid first so the reservoir doesn't overflow when you push/turn the pistons back in.
Have you closely inspected the brake-pedal-to-master linkage and the pedal pivot point?
Are you sure the gritters are not caused by that?
if a bleed were to cure this, do you think a 'gravity bleed' will do just fine?
With a gravity bleed you don't press the pedal.
If its fresh fluid you want, then yes.
Why not do both?
First a pedal stroke (or two) per wheel and then the last bit by gravity?
Just a thought
Keep your eye on the reservoir during this (IOW make sure it doesn't get below minimal).
And.. do not forget, that IF you top it right up after you're done, when changing pads in 1-2 years or so, to drain some fluid first so the reservoir doesn't overflow when you push/turn the pistons back in.
Have you closely inspected the brake-pedal-to-master linkage and the pedal pivot point?
Are you sure the gritters are not caused by that?
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08-20-2007, 11:31 AM
#8
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Thread Starter
i've tried to look under there before. its just so difficult to inspect stuff. i have put some silicone spray down there to maybe help, but i dont think its in the linkage. it just sucks, that this is something that comes once in a while, makes it that much harder to diagnose.
08-22-2007, 06:36 PM
#9
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Thread Starter
well, did the flush and bleed today. did a couple pedal bleeds, but mostly did the 'gravity' bleed. took a long time. we'll see how it drives tomorrow. drove around a bit tonight, but didnt notice the grittiness. didnt drive around much, so that might be it.
