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Pedal issue after brake pad change

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Old Nov 17th, 2019, 22:07   #1
mjg1966
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Default Pedal issue after brake pad change

I have changed the pads front and rear, used a pipe clamp and opened the bleep nipple during compression of the piston. The brake pedal was spongy after this so I have undertaken a simple bleed of all calipers. Before start-up the brake pedal is firm but after it becomes softer again. It just seems softer than what I would expect were it just to be a bedding-in issue. Any ideas as to what have I broken or is it worth getting a pressure bleeder and doing the bleeding again using this method?
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Old Nov 17th, 2019, 22:15   #2
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Could be a bedding in issue, the pedal is always softer after startup due to the vacuum assistance.

What brake pads did you use? Cheap pattern pads can be like this.

What happens if you pump the pedal?
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Old Nov 17th, 2019, 22:24   #3
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Could be a bedding in issue, the pedal is always softer after startup due to the vacuum assistance.

What brake pads did you use? Cheap pattern pads can be like this.

What happens if you pump the pedal?
Thanks for the reply.
Volvo pads.
Pedal firms up again.
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Old Nov 18th, 2019, 17:28   #4
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A small diameter tube must be put over the bleeder to prevent air from entering the caliper. Another thing is installing the caliper spring the correct way https://www.youtube.com/watch?v=Kh8wQNHbedo
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Old Nov 18th, 2019, 19:01   #5
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Originally Posted by mjg1966 View Post
Thanks for the reply.
Volvo pads.
Pedal firms up again.
You could try one last bleed.... if you open the bleed nipples one turn and then a full slow press on the brake pedal, release slowly, and then remove the pipe from the nipple just let the fluid dribble out under gravity for about a minute before tightening. (The syphon effect of fluid in the pipe can draw air back into the caliper via the bleed nipple threads). Once you've tightened the nipple, hose the caliper down to disperse any spilled fluid.

Then maybe try and bed them in to see if it makes any difference?
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Old Nov 18th, 2019, 19:28   #6
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Thanks folks. I intend to do a fluid change in any case as I believe its more than 2 years old. I will also check those springs!
Love the car, this is my first XC90 after 940, 760, 960, V90. Also had other makes but it is the best all-round vehicle I have ever had - I think it is this that makes me so nervous!
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Old Nov 19th, 2019, 13:02   #7
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Is this incorrect then?
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Old Nov 19th, 2019, 13:28   #8
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See here.



https://www.volvoforums.org.uk/showthread.php?t=300575
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Old Nov 19th, 2019, 15:46   #9
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Buy a bleed kit with a hand vacuum pump on it. Makes bleeding the brakes so much simpler.

Surprised you clamped the hose though, this generally isn't needed on callipers now as they shouldn't leak. Maybe you damaged the hose which is resulting in the sponginess.
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Old Nov 19th, 2019, 16:03   #10
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Quote:
Originally Posted by mjg1966 View Post
I have changed the pads front and rear, used a pipe clamp and opened the bleep nipple during compression of the piston. The brake pedal was spongy after this so I have undertaken a simple bleed of all calipers. Before start-up the brake pedal is firm but after it becomes softer again. It just seems softer than what I would expect were it just to be a bedding-in issue. Any ideas as to what have I broken or is it worth getting a pressure bleeder and doing the bleeding again using this method?
You will probably find you have fitted new flat pads on worn concave discs , so the pad acts like a bridge across the void so when you press the brake the piston forces the pad and causes it to bend slightly , hence the springiness , If your discs look at all dished or have a noticeable lip i would replace them ...
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