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XC90 '02–'15 General Forum for the P2-platform XC90 model |
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Pedal issue after brake pad changeViews : 1174 Replies : 18Users Viewing This Thread : |
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Nov 17th, 2019, 22:07 | #1 |
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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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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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Nov 17th, 2019, 22:24 | #3 |
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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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Nov 18th, 2019, 19:01 | #5 |
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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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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!
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Nov 19th, 2019, 13:02 | #7 |
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Is this incorrect then?
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Nov 19th, 2019, 13:28 | #8 |
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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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Nov 19th, 2019, 16:03 | #10 | |
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