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Brakes spongy after changing pads.

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tvr321
Nitrous Nuisance



Joined: 20 Sep 2009
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PostPosted: 13:13 - 07 Dec 2009    Post subject: Brakes spongy after changing pads. Reply with quote
I took my worn brake pads off in the workshop and then left the bike for a day whilst I waited for the new ones to arrive. During that time, someone had come along and pulled the front brake lever, pushing the pistons out. I didn't think much of it at the time and just pushed them back in. After putting everything back together, there was no feeling in the brakes at all even after pumping for ages. So I asked my Dad and he helped me bleed the brakes (the proper way). Put in some new fluid and they still feel a little spongy.

What could the problem be?

Thanks.
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Kickstart
The Oracle



Joined: 04 Feb 2002
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PostPosted: 13:22 - 07 Dec 2009    Post subject: Reply with quote
Hi

Probably still air in the system. Air often gets stuck in the top banjo bolt. Check there is enough fluid, put a spanner on the top banjo, wrap the master cylinder, spanner, etc in some cloth, pull the brake lever hard and while it is pulled crack off the banjo bolt (allowing a tiny bit of fluid and hopefully air to escape) and tighten it again.

The cloth is just there to catch the fluid to stop it spraying all over the place.

All the best

Keith
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iooi
Super Spammer



Joined: 14 Jan 2007
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PostPosted: 15:49 - 07 Dec 2009    Post subject: Reply with quote
How worn are the disks.

As new pads will take a bit to fully bed into the disk.
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oldbiker
Nitrous Nuisance



Joined: 15 Nov 2009
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PostPosted: 19:04 - 07 Dec 2009    Post subject: Reply with quote
Sounds like air to me, also.
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jefflthomas
L Plate Warrior



Joined: 07 Dec 2009
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PostPosted: 15:05 - 09 Dec 2009    Post subject: Reply with quote
pull the lever as close to the bar as possible & tie it there

leave it at least overnight
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chris-red
Have you considered a TDM?



Joined: 21 Sep 2005
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PostPosted: 15:19 - 09 Dec 2009    Post subject: Reply with quote
jefflthomas wrote:
pull the lever as close to the bar as possible & tie it there

leave it at least overnight


Open the top of the reservior if you do this (leave it covered mind)
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jefflthomas
L Plate Warrior



Joined: 07 Dec 2009
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PostPosted: 15:35 - 09 Dec 2009    Post subject: Reply with quote
chris-red wrote:
jefflthomas wrote:
pull the lever as close to the bar as possible & tie it there

leave it at least overnight


Open the top of the reservior if you do this (leave it covered mind)


if they're only a bit spongy i wouldn't bother with the lid personally

be a minuscule variation

Last edited by jefflthomas on 15:40 - 09 Dec 2009; edited 1 time in total
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cypher
Nitrous Nuisance



Joined: 03 Apr 2007
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PostPosted: 15:38 - 09 Dec 2009    Post subject: Reply with quote
Its as the other guys say, air sitting near the banjo bolt on the Master Cylinder where your lever goes. On my NC, it had no brakes at all until I had bled it here!
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Old Thread Alert!

The last post was made 16 years, 65 days ago. Instead of replying here, would creating a new thread be more useful?
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