Pedal Pump Up?
 

I know there are faq's on how to fix this, but could someone explain it a little better on how to fix it for good? Any help is appreciated. thanks

Re: Pedal Pump Up?
 

Sorry, I have a 97 gst with a act 2100 clutch, new master and slave cylinder's aws well.

Re: Pedal Pump Up?
 

Do you still have the OEM rubber clutch line?

Re: Pedal Pump Up?
 

Yes, I still have the oem lines, where can I get upgraded replacements? I know the faq's say to adjust your pedal travel, but I don't see how that could afect a hydraulic system? Because wouldn't you still be putting pressure into the system, and it would still somehow not be relaeasing all the pressure?

Re: Pedal Pump Up?
 

To fix mine for good, I changed the Master cyl, slave cyl & installed a SS braided clutch line. For the heck of it, I also put on a new clutch fork and pivot ball.

If you have a 2g, this is the infamous 2g pedal pump up.

Taken from RRE's site:

If you are fighting an inconsistent pedal adjustment in a 2G, adjust the upper pedal stop adjuster so that you gain additional free play at the top of the pedal travel. If this is your problem, you will notice that the pedal suddenly gets very tight and the release point will suddenly move up a lot, this is the cause.


2Gs need free play at the top of the pedal travel. If it is close to no travel and right on the edge, then it pumps up. Only 2Gs have a relief valve in the master cylinder that needs to be uncovered so fluid can go back into the reservoir on the clutch release. If not, it gets tighter and tighter and tighter. Then it may slowly relieve the pressure and it is back to normal. Just a 2G thing. You need more free play at the top of the pedal travel.

Left unchecked, the pedal will pump up more and more. The clutch will begin to slip since it is as if you are driving around with your foot on the clutch pedal. Also it plays hell on the crankshaft thrust bearings. The constant pressure pushes the clutch release bearing onto the clutch and flywheel. When centrifugal force throws the clutch release fingers outwards, they make additional pressure on the thrust bearings of the crank. This is an additional factor in short lived crankshaft release bearings and an additional potential cause for crankwalk.

Re: Pedal Pump Up?
 

Well you could either have one made, contact any of the site sponsors, or call one of the major DSM vendors (Buschur, RRE, etc.). I got mine from Buschur.

Re: Pedal Pump Up?
 

All you need is to have the clutch pushrod at the pedal adjusted correctly. 2g cars are notorious for pedal pump-up ".

Go down to the lower section of this page and read.

Re: Pedal Pump Up?
 

Thanks guy's for the help, I'll get one of those steel braided lines ordered up, thanks Jakey. But with the push rod, can anyone know what the proper spec is? I mean since some people have a CFDF clutch, I have a ACT, wouldn't it be different on different systyems? When I had my slave and master installed, the guy put the push rod way to far into the master so it was holding the system partially open, I moved it back and it seems ok, but I;m sure now I will have to adjust my pedal travel. And hope that fixes it. Thanks again for the help.

Re: Pedal Pump Up?
 

https://secure.buschurracing.com/cat...b703ad3cb4b417

http://www.roadraceengineering.com/ecldrivetrain.htm

Re: Pedal Pump Up?
 

hang on guys, he should check for crankwalk first. I had signs of pedal pump up, and my car was crankwalked like 0.60.

Re: Pedal Pump Up?
 

I adjusted my clutch rod to the point it became ridiculous. I'm pretty sure it was my master cylinder that was shot at the time.

I'd adjust it so it it disengaged about 1.5" or so off the floor. When I drove around for like 15 minutes though, it would disengage WAY off the floor which would cause major slippage. When the car sat for a while, it would disengage back to 1.5". I kept chasing a problem that couldn't be fixed so i just replaced everything.

But yes- you should check for crankwalk first.

Re: Pedal Pump Up?
 

So I take it if I have crankwalk, the engines pretty much on it's way to the junkyard? I replaced everything except the clutch lines and the clutch fork and pivot ball, but I was told those were pretty much none wear items. Ok, whats the quickest way to diagnose for crankwalk. When I first bought my car I put like 700 into it, had to get the keyway, little piece was shot, and I was told if I didn't get that replaced I could get crankwalk also. Would buying a engine kit with all the pistons and rods and new crank help to reduce the chances of crankwalk. I now where I can get a kit for around 500 or so.

Re: Pedal Pump Up?
 

Hang on?? He just changed his clutch master & slave cylinder. He should check the adjustment before he does anything else.

The way you're talking, he'll be pulling the engine for nothing.