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Author Topic: Brake pedal travel - spongy  (Read 3433 times)

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Bandit127

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Re: Brake pedal travel - spongy
« Reply #15 on: 01 March 2008, 21:07:03 »

Quote
Quote
If you use the easibleed again make sure you have at least 30psi in the wheel you are using when I use mine I put around 35 psi in it and fill the resovior to within an inch of the top.

Don't want an argument here but the last time I used one the instructions said no more than 15 psi as it affects the seals?

(Which was probably the last time I Please read the manual as it happens....)

Jim


In fact, here is "TFM" to "R"... 20 psi.
http://www.gunson.co.uk/items/pdf/Products/G4062_Instructions.pdf
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Jukeboxnut

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Re: Brake pedal travel - spongy
« Reply #16 on: 01 March 2008, 21:18:25 »

I've used 30 psi with my easibleed on both my old Omega and this one with no problems but I read somewhere that if you are bleeding the clutch you should reduce the pressure to 15 psi though I can't remember why.  As my cars are autos this does not apply.
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achoo81

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Re: Brake pedal travel - spongy
« Reply #17 on: 01 March 2008, 21:32:35 »

Don't want to argue about it just saying what the instructions say on my Gunsons one, plus I found that it worked better if the pressure was at least 30 psi.
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Andy B

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Re: Brake pedal travel - spongy
« Reply #18 on: 01 March 2008, 21:36:41 »

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Quote
If you use the easibleed again make sure you have at least 30psi in the wheel you are using when I use mine I put around 35 psi in it and fill the resovior to within an inch of the top.

Don't want an argument here but the last time I used one the instructions said no more than 15 psi as it affects the seals?

(Which was probably the last time I Please read the manual as it happens....)

Jim
I ended up with fluid everywhere when I didn't drop the spare wheel pressure. :(   :y
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achoo81

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Re: Brake pedal travel - spongy
« Reply #19 on: 01 March 2008, 21:36:50 »

The reason they say to use 15psi on clutch bleeding is because the master cylinder is a lot smaller than the brake ,also shorter pipe run more chance to do damage to seals.
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JamesV6CDX

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Re: Brake pedal travel - spongy
« Reply #20 on: 01 March 2008, 22:10:58 »

Jaime, you say original disks / pads were FUBAR, have you given them chance to bed in? About 50 miles with strong brake use? :)
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TheBoy

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Re: Brake pedal travel - spongy
« Reply #21 on: 01 March 2008, 22:18:48 »

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Jaime, you say original disks / pads were FUBAR, have you given them chance to bed in? About 50 miles with strong brake use? :)
This isn't a bedding in problem, there is just too much pedal travel.

I can stand it on its nose (apparently ::)), but the pedal is through the boards on the tarmac to do so....
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Bandit127

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Re: Brake pedal travel - spongy
« Reply #22 on: 01 March 2008, 23:14:28 »

TheBoy - please keep us posted on this. My pedal probably goes 2" when the foot expects 1/2". It always doesn't feel right but I always get full anchors and a hard pedal when it gets there.

In the days before ABS could store an airlock it would be the master cylinder seals. The pedal eventually pumps up but not as immediately as it does with air in the system and you still get full brakes, again unlike air in the system. I don't want to be stripping the master cylinder if bleeding will sort it...

Thanks, Jim
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TheBoy

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Re: Brake pedal travel - spongy
« Reply #23 on: 02 March 2008, 09:28:08 »

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TheBoy - please keep us posted on this. My pedal probably goes 2" when the foot expects 1/2". It always doesn't feel right but I always get full anchors and a hard pedal when it gets there.

In the days before ABS could store an airlock it would be the master cylinder seals. The pedal eventually pumps up but not as immediately as it does with air in the system and you still get full brakes, again unlike air in the system. I don't want to be stripping the master cylinder if bleeding will sort it...

Thanks, Jim
Omegas do have progessive brakes, so if you've come from cars like Focus etc with hairline triggers, it takes getting used to.

Obviously, I drive enough Omegas to know tractor aint right :(
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TheBoy

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Re: Brake pedal travel - spongy
« Reply #24 on: 02 March 2008, 14:05:20 »

All sorted, thanks for all your help :y

A play with the Tech2 pinpointed the problem to NSF brake, so rebleed that one (the old fashioned way with Mrs TheBoy on pedal duty), and there was a fair bit of air in it.

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albitz

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Re: Brake pedal travel - spongy
« Reply #25 on: 02 March 2008, 14:10:51 »

as someone who doesnt know much about this electricity stuff....how does tech 2 know that youve got air in your brake caliper :question  :-/
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Andy B

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Re: Brake pedal travel - spongy
« Reply #26 on: 02 March 2008, 14:22:35 »

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as someone who doesnt know much about this electricity stuff....how does tech 2 know that youve got air in your brake caliper :question  :-/
Yes! What he ^^^^^^ said!  :-?  :y
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TheBoy

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Re: Brake pedal travel - spongy
« Reply #27 on: 02 March 2008, 14:26:20 »

Because you can play silly buggers with each individual brake (or each front, and rears as a pair on pre 98 cars).
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Marks DTM Calib

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Re: Brake pedal travel - spongy
« Reply #28 on: 02 March 2008, 15:01:35 »

Yes, with tech2 under the actuator test or ECU control you fire actuators at will.....so spin a wheel (or drive it down the road) and get the ABS to try and stop it....if there is air in the system it wont stop!
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albitz

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Re: Brake pedal travel - spongy
« Reply #29 on: 02 March 2008, 15:13:11 »

i had to read that twice,couldnt believe what i was reading,sounds like an awesome piece of kit 8-)
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