MOT Day

colin32 · 12th June 2008, 19:28

Took my 75 02 cdt for it's mot and it failed on tyres and brake pad wear. So had 2 new tyres and new front pads fitted but now the brake pedal travels a lot further and feels soft and spongy with poor braking efficiency. I can also hear a rush of air as the pedal is depressed.Is it possible for air to enter the system during pad replacement?

tony g · 12th June 2008, 19:37

Quote:

Originally Posted by colin32

Took my 75 02 cdt for it's mot and it failed on tyres and brake pad wear. So had 2 new tyres and new front pads fitted but now the brake pedal travels a lot further and feels soft and spongy with poor braking efficiency. I can also hear a rush of air as the pedal is depressed.Is it possible for air to enter the system during pad replacement?

this is fairly normal for new pads, give them time to bed in, about a 100 miles or so will do. no air can't enter the system when having new pads fitted.

afcbadam · 12th June 2008, 20:12

has it been blead properly. try pumping the pedal for a minute or 2. or is there enough fluid in the system. i know this sounds like im stateing the obvious but i have heard of it before

colin32 · 12th June 2008, 21:00

Quote:

Originally Posted by afcbadam

has it been blead properly. try pumping the pedal for a minute or 2. or is there enough fluid in the system. i know this sounds like im stateing the obvious but i have heard of it before

In the days when I would change my own pads, it was a simple matter of removing the master cylinder cap prior to pushing the the caliper piston back and no air could enter the system, however, Haynes says open the bleed nipple and clamp the flexible hose to expel excess fluid. Presumably if this was not done correctly, it would allow air to enter.
I'm hoping it's just a matter of waiting for the pads to bed in, but previously the pedal was nice and firm and now it feels as if the brakes has lost all it's power assistance.

JohnDotCom · 12th June 2008, 22:15

That doesn't sound right to me.
I have never had that after changing my pads to date.

Simon · 12th June 2008, 22:26

I would also concur that a spongy feeling in the pedal would indicate air has got into the system somehow. Never changed pads on a car but on a mountain bike I have removed and changed pads on a hydraulic system and didn't need to touch any bleed nipples or the master cylinder caps (although they were self-adjusting with regard to brake pad wear....) I'm digressing again..... Sorry

12th June 2008, 19:28	#1
colin32 Newbie Rover 75 Saloon Join Date: Feb 2007 Location: Preston, Lancs Posts: 29 Thanks: 1 Thanked 0 Times in 0 Posts	MOT Day Took my 75 02 cdt for it's mot and it failed on tyres and brake pad wear. So had 2 new tyres and new front pads fitted but now the brake pedal travels a lot further and feels soft and spongy with poor braking efficiency. I can also hear a rush of air as the pedal is depressed.Is it possible for air to enter the system during pad replacement?

12th June 2008, 20:12	#3
afcbadam Gets stuck in 2004 MG ZS 180 Join Date: May 2008 Location: Southampton Posts: 978 Thanks: 0 Thanked 0 Times in 0 Posts	has it been blead properly. try pumping the pedal for a minute or 2. or is there enough fluid in the system. i know this sounds like im stateing the obvious but i have heard of it before __________________ AFC Bournemouth www.themgzs.co.uk Inner wing open cone Oil catch tank Janspeed cat back Janspeed de-cat Reidy Re-mapped

12th June 2008, 22:15	#5
JohnDotCom * Rover 75 FaceLift Tourer CDTi 170BHP Auto ConnSE 2005 Model Starlight Silver Join Date: Nov 2006 Location: Abergele Posts: 28,735 Thanks: 0 Thanked 6 Times in 5 Posts	That doesn't sound right to me. I have never had that after changing my pads to date.

12th June 2008, 22:26	#6
Simon Banned - Join Date: Nov 2006 Location: - Posts: 10,318 Thanks: 0 Thanked 4 Times in 3 Posts	I would also concur that a spongy feeling in the pedal would indicate air has got into the system somehow. Never changed pads on a car but on a mountain bike I have removed and changed pads on a hydraulic system and didn't need to touch any bleed nipples or the master cylinder caps (although they were self-adjusting with regard to brake pad wear....) I'm digressing again..... Sorry