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Depressing: Brake Pedal Sinks Toward Floor
http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=5&t=23987		 Page 1 of 1
Author:  Wobbly [ Sun Sep 02, 2007 1:33 am ]
Post subject:  Depressing: Brake Pedal Sinks Toward Floor
As my 06' CRD with 19K on it came to a stoplight at the top of a hill, I depressed the brakes and noticed that the pedal kept
going down as I applied pressure to it. It doesn't go to the floorboard yet, but it seems that the master cylinder must be leaking internally.

Is this a common problem with Libertys?
Author:  litton [ Sun Sep 02, 2007 10:35 am ]
Post subject: 
I've seen that same thing on almost every new(er) car. Seems to be pretty normal but I have no idea why it happens.
Author:  Wobbly [ Sun Sep 02, 2007 12:23 pm ]
Post subject: 
litton wrote:
I've seen that same thing on almost every new(er) car. Seems to be pretty normal but I have no idea why it happens.


Our Passat TDi has a firm pedal.

Here's a quote I found: "Bob Jasper IN wrote:
Have any of you noticed that your brake pedal will fade all the way to the foor if you press hard while stopped ? My dealer tells me all of the diesels do that. Funny it didn't start until they replaced the master cyl. I have checked other gas Liberty's and one 06 CRD , they all have a hard pedal.Am I just beeing screwed with?"
Author:  BlackLibertyCRD [ Sun Sep 02, 2007 12:57 pm ]
Post subject: 
The brake pads may be worn close allowing lots of fluid behind the pistons of the calipers. This will require alot more pedal travel to stop the vehicle.
Author:  Nikko_UK [ Sun Sep 02, 2007 1:03 pm ]
Post subject: 
When you checked the other Libbys' were the engines running? The engines need to be running to build preasure up in the master servo.

Also i remeber reading in a Haynes Manual for my last vehicle that if the engine is running and you hold you foot on the brake pedal the pedal SHOULD sink slowly downwards and that this means that the servo is working corectly.
Author:  litton [ Sun Sep 02, 2007 4:38 pm ]
Post subject: 
Yep, just went out and checked the Liberty and my GC.....both do the same thing when stopped the pedal will slowly drift towards the floor. No problem with stopping though.
Author:  Wobbly [ Sun Sep 02, 2007 6:08 pm ]
Post subject: 
Thanks for the replies. Guess this pedal action is normal behavio(u)r :D
Author:  flash7210 [ Sun Sep 02, 2007 9:01 pm ]
Post subject: 
BlackLibertyCRD wrote:
The brake pads may be worn close allowing lots of fluid behind the pistons of the calipers. This will require alot more pedal travel to stop the vehicle.


They way it's supposed to work is as the pads wear, more fluid fills the
gap so that the pad remains in contact with the disc. The extra fluid
comes from the resevoir and return springs on the pistons in the master
cyl ensure that proper pedal travel is maintained. When the brake
warning light comes on, it usually means that your fluid is low (there is a
level switch in the reservior). This is usually because all the fluid has
moved from the reservior to the calipers because the pads have worn too
much. Don't add more fluid. When new pads are installed fluid lever will
return to normal.
The true test of a bad master cyl is at a stop light. If it feels like you
have to keep pushing the pedal a little further down just to keep
the vehicle from creeping ahead then something is wrong.
Most diesels that use hydraulic brakes use a hydraulic assist (hydraboost)
from the power steering pump. Our CRD's use vacuum assist which
should make it feel just like every other gasser you've driven.
Author:  GilaMonster [ Sun Sep 02, 2007 9:09 pm ]
Post subject: 
litton wrote:
Yep, just went out and checked the Liberty and my GC.....both do the same thing when stopped the pedal will slowly drift towards the floor. No problem with stopping though.


Same here on my KJ, kinda strange when one is bleeding them.
Author:  Pablo [ Sun Sep 02, 2007 11:14 pm ]
Post subject: 
GilaMonster wrote:
litton wrote:
Yep, just went out and checked the Liberty and my GC.....both do the same thing when stopped the pedal will slowly drift towards the floor. No problem with stopping though.


Same here on my KJ, kinda strange when one is bleeding them.


Same here, but it takes more pedal pressure than what would seem normal to hold the vehicle at a stop. The engine really likes to pull. I have got into the habit of dropping into neutral when stopped at red lights as I figure less heat is better for the tranny-- and I don't have to push on the pedal so hard.

One day I will do the steel braided lines and see if they help.
Author:  Jeger [ Tue Sep 04, 2007 8:04 am ]
Post subject: 
I thought this was normal with CRD's? Something to do with how the vacuum system works if I remember correctly.

Mine has done this since new...no problem with braking power.
Author:  danoid [ Tue Sep 04, 2007 9:02 pm ]
Post subject: 
Check to see if any vacuum lines near the master cylinder are kinked or if possible check them for leaks.
Author:  bentrod [ Wed Sep 05, 2007 11:00 am ]
Post subject: 
My KJ makes a one time click from the brakes or brake pads when backing up. If I let go and put my foot back on the brakes it clicks for every time its pressed. Click, click, click...
Anyone else getting this too?
I took a look and its all tight.
Author:  Jeger [ Wed Sep 05, 2007 3:03 pm ]
Post subject: 
bentrod wrote:
My KJ makes a one time click from the brakes or brake pads when backing up. If I let go and put my foot back on the brakes it clicks for every time its pressed. Click, click, click...
Anyone else getting this too?
I took a look and its all tight.


I got it... does it nearly 100% of the time. It sounds like a spring catching on something. It must not bother me too bad because I have never looked for the culprit.
Author:  BlackLibertyCRD [ Thu Sep 06, 2007 12:20 am ]
Post subject: 
bentrod wrote:
My KJ makes a one time click from the brakes or brake pads when backing up. If I let go and put my foot back on the brakes it clicks for every time its pressed. Click, click, click...
Anyone else getting this too?
I took a look and its all tight.


When you brake in reverse, you cause the anti rattle clips to compress and you hear a click, also normal.
Author:  Jeger [ Thu Sep 06, 2007 9:37 am ]
Post subject: 
Jeger wrote:
bentrod wrote:
My KJ makes a one time click from the brakes or brake pads when backing up. If I let go and put my foot back on the brakes it clicks for every time its pressed. Click, click, click...
Anyone else getting this too?
I took a look and its all tight.


I got it... does it nearly 100% of the time. It sounds like a spring catching on something. It must not bother me too bad because I have never looked for the culprit.


Oops, I misread that... my clicking is coming from the brake pedal area not the brake pad area :oops:
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