Brake pads changed....brakes seem weaker

D

deek19790

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Hi guys,

So I've change my front and rear pads, I didn't open the brake fluid line just pushed the pristons in and put the pads in.

But since changing I've noticed that I need to push the brake pedal that like bit more to brake and also to sharp brake it goes almost all the way down.

when the engine is on I can put my leg on the pedal and slowing push it down more or less to the floor ( lowest point my shoe can still get in gap between pedal and floor).

I'm guessing as it doesn't go all the way my master brake cylinder is ok.... What other test can I do to make sure,

Do you think my brakes could need bleeding? Strange as I didn't open the system.

I was gonna take my car in for brake fluid change as it's due to the main dealers, if they change fluid I'm assuming that they will have to bleed to ensure no air bubbles in system is this correct?

Any advise would be great

D
 
Hi mate,

Sorry changed them about a month ago and did at least two full tanks since then

D
 
Yer the pads should start to feel good again within at least 50-100 miles depending on disc condition. But 2 tanks later they should be mint. The only other thing is, it is easier to boil the fluid with new pads because they aren't as efficient to start with and take more force for a longer period of time to create the same stopping force, creating more heat. So maybe it is time for a fluid chance anyway. Certainly wouldn't hurt if it's not been done for a while or for now just to see if it is the problem just go around each bleed nipple and open, if there is air there it will bubble out within a few seconds, if it's a steady stream of fluid with no bubbles your pretty much safe so lock off the nipple a proceed to the next making sure the fluid is topped up but if you've not long pushed all 4 pistons back this will be on the max anyway (if not slightly overfull)

Hope this helps, sorry for the essay :thumbsup:
 
If that fails it means you have invested in some brake pad material that contains recycled cow pats.
 
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Hi,

They original Audi pads so not chance of them being crap.

The brake fluid needs changing anyway so if I get this changed will I still need to bleed them or as part of the process of fluid change this will happen automatically.

Thanks
D
 
When you put new fluid in, it pushes the old out when bleedding
 
Lee,

Sorry but I'm don't know much about changing fluid just really need to know if I need to get fluid changed and bleed or will the fluid change also automatically bleed System

Also on my way to work at this moment was telling a mate and he goes all that needs to happen is he opens a a valve and I push pedal all way down this will bleed system....I was under impression that if pedal does all way down the master brake cylinder will get messed up


Thanks
D
 
fluid change will automatically bleed the system.
It has been known for the master cylinder seals to twist if the pedal goes to the floor, as because they are not used to travelling that full distance. I don't think it is much for a fluid change.
Chances are the garage will use a pressure bleeder anyway, rather than using a pedal.
 
cheers guys, will get brake fluid changed as need it anyway hopefully will resolve issue.
 
deek19790 said:
Hi,

They original Audi pads so not chance of them being crap.

The brake fluid needs changing anyway so if I get this changed will I still need to bleed them or as part of the process of fluid change this will happen automatically.

Thanks
D
Click to expand...

When you say Original Audi pads, are they direct from a dealer or off ebay etc... as fake parts in OEM boxes are common!
 
Parts should be fine, as above it's probably bedding in which can take a long time, especially on the rear.

As it's been wet recently you should be able to tell if the pads are more or less fully bedded by seeing if the swept area of the disc is nice and clean - rusty rings will be seen otherwise. Get the fluid changed also but it won't likely have gone "off" since changing the pads.
 
Cw,

Was thinking it could be air as my pedal goes completely down if I put abit or force into it while the engine is on, if off then it doenst go down at all

Why do you think the pedal goes down?
Thanks
D
 
That is normal to a degree, as the servo is acting on the brakes with the engine on so gives power assistance. Until the pads are 100% bedded on the discs there will be more travel than normal at the pedal.

You can normally tell if there is air in the system if the brakes don't work when you start to press them very lightly, but if you can feel them start to grab even just slightly then that is usually indicating still need bedding.

Can you take photos of your discs through the wheels?
 
Thanks for clarification on why the pedal goes all the way down, I will test if brakes start to work when lightly tapped and update after 5.30pm

D
 
Hi,

Ok I have tested while moving in traffic and applying the breaks a tiny bit does slow down car but wouldn't stop it....so I guess the brakes are working but taking more of a push to actually stop the car, I also tested emergency braking and the car only stops of foot goes all the way down in pedel, before half way stopped the car.

D
 
It's hard to say without feeling it how much the movement it, get them bled anyway if it's due
 
Hi,

Gonna get fluid replaced as that's due, been told that will bleed them as well automatically on this forum so two jobs in one I guess.

D
 
Did you replace the pads yourself? I thought the rears required a special tool to wind the calipers in (rather than push them back)? Maybe you've ****** them? Just sounds odd why you're having symptoms of air in the calipers when you clearly didn't touch anything?

Have you checked the fluid level since you bedded them in? You should of removed the brake reservoir cap when replacing the pads - the excess fluid has to go somewhere!
 
Hi,

Yes I changed them myself, I used a twist and push type tool that I brought off the net specially designed for the rear brakes......I didn't open the resovoir as completely forgot to do this.

You think that might have caused the issue?

D
 
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