XJ XJ6 / XJ8 / XJR ( X350 & X358 ) 2003 - 2009

Brake Pedal Feel

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Old 04-12-2011, 02:17 AM
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Default Brake Pedal Feel

Can anyone tell me that if their pedal does this,(or give it a try and let me know)..
After coming to a stop the pedal can be pushed (all be it with a fair amount of pressure) close to the floor?
The brakes stop well, with good feel...but, I am still a little peturbed by this. New rotors, new pads,and all looks good visually,no fluid loss,all componets looking good.
The pedal does retain position and pressure after full stop ( unlike a failed master cyl) but will keep lowering with a good push after a full stop.It never seems to get rock solid till close to the floor yet brakes always apply after just a little stroke and will come to full stop at about mid point of travel,but you can then keep pushing on down if you apply a fair amount of pressure
New master is on and multiple bleeds do not seem to improve much.I know these pedals are always a little soft on feel but I don't remember it doing this, then again maybe I never tried to push it so hard as I am now that I am sensitized.
If no one else here can experience this then I am thinking air somewhere or a manufacture fault in the master cylinder that was just installed.Could anything else cause this?
Sorry to labour the issue but I am a long way from a dealer.
Thanks.
 
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Old 04-12-2011, 08:15 AM
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My X300 does the same thing.

The softer, dropping pedal is a common thing on ABS equipped cars, broadly speaking. I don't think I've ever driven an ABS equipped car that had the "rock hard" pedal of older, non-ABS cars.

I'm not syaing there *isn't* a fault with yours but don't judge that based on the absence of a rock hard pedal.

But I suspect you are sensitized, as you mention. What happens, even to me, is that we suddenly become hyper-aware of the brake pedal after brake repairs are done.

I've played tricks on my own family members to verfiy that this really happens. I'll say that I bled their brakes, although I haven't, and without fail they'll complain that the pedal now feels soft.


Cheers
DD
 
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Old 04-12-2011, 03:52 PM
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You might have a leak in the brake vacuum booster ckt. At least, given all that you have done so far and given that you still think the brakes are "funny" that's what I'd look at.
 
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