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E36 M3 (1992-1999) {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999


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Old Tue, Sep-20-2016, 09:45:10 AM   #1
kyrix1st
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Default Reverse grind after clutch hydraulic overhaul

Just as mentioned above. It is very hard to put the car in gears, and reverse grinds everytime I try to put it into gear. It did not happen before hydraulic hose went out, so I dont think clutch is the cause. What is your experience on this matter?
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Old Tue, Sep-20-2016, 09:46:03 AM   #2
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Default Re: Reverse grind after clutch hydraulic overhaul

Also, my clutch engage point has been furtherr down, as soon as I release the pedal it engages
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Old Tue, Sep-20-2016, 12:48:40 PM   #3
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Default Re: Reverse grind after clutch hydraulic overhaul

Update: Dealership did it again; much better than before, but my reverse still grinds sometimes. I'm gonna need something better than what dealership offers, any suggestions?
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Rear: Stock-Endless CC-RG //
Recaro SPG, SR-2//
Sparco 35cm steering//
Motorsport Style 24 7.5J//GruppeM ram air//LTW rear spoiler//
Hella headlights//
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Old Tue, Sep-20-2016, 01:59:38 PM   #4
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Default Re: Reverse grind after clutch hydraulic overhaul

You need to bleed the clutch with the slave cylinder OFF the transmission and compressed in a jig. This gets the bleed screw into a proper location, and minimizes the fluid volume inside the slave.
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1999 323i KP/GTS2 Alpinweiß - Hood-in-the-windshield mod
1995 M3 Dakargelb/Black - S50B32/S6S420G, Diffsonline 3.91, H&R/Bilstein, Hotchkis, AS SSK, etc...
1990 325is Brilliantrot/Tan - GC/Bilstein, Sway
1989 325is Alpinweiß/Black - Decontenting...
1989 M3 Alpinweiß/Black - S62B50 in progress...

Hers: 1996 Porsche 911 Turbo Black/Black - UMW LTW Flywheel, Bilstein
Hers: 1988 325iX Coupe Diamondschwartz/Black 5spd - Korman lengthened front driveshaft, 272 cam, H&R/Bilstein

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Old Tue, Sep-20-2016, 08:21:25 PM   #5
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Default Re: Reverse grind after clutch hydraulic overhaul

If you have a clutch stop, make sure that they didn't change its height. It sounds like your clutch isn't disengaging properly so it could be a number of things in the system, but more than likely just needs to be bled properly. What exactly did the dealer replace?


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Old Wed, Sep-21-2016, 12:46:42 AM   #6
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Default Re: Reverse grind after clutch hydraulic overhaul

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Originally Posted by EvanUner View Post
If you have a clutch stop, make sure that they didn't change its height. It sounds like your clutch isn't disengaging properly so it could be a number of things in the system, but more than likely just needs to be bled properly. What exactly did the dealer replace?


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All the clutch control lines including master slave cylinder
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Old Wed, Sep-21-2016, 12:54:26 AM   #7
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Default Re: Reverse grind after clutch hydraulic overhaul

Assuming they installed the correctly matched master and slave for your car, the only things that I can see causing this issue are an incorrectly bled system, or actual clutch pedal travel (clutch stop). As the other person mentioned, I would try to bleed the clutch again, and also make sure nothing is interfering with pedal travel.


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Old Wed, Sep-21-2016, 07:37:11 AM   #8
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Default Re: Reverse grind after clutch hydraulic overhaul

Update#2: After driving around for a while and occasionally opening brake fluid reservoir to check for air bubbles, clutch feel kind of got firmer and it no longer grinds when I put it in reverse.

I suspect that some of the normal driving sort of got the air out of the master cylinder(having three hoses: two connecting to brake fluid one to slave cylinder) since slave cylinder was said to be "perfectly done" using BMW special tool at the dealership.

My clutch (race clutch+lightweight flywheel) used to engage at about 20-30% off the floor and it feels about the same unlike the first time which immediately engaged as soon as I took my foot off.

I'll keep the post updated. Does anyone have experience with reverse bleeding?
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Bilstein PSS9 w/ Swift linear springs//
Front: E31 840Ci Brembo 4P-Endless MX72//
Rear: Stock-Endless CC-RG //
Recaro SPG, SR-2//
Sparco 35cm steering//
Motorsport Style 24 7.5J//GruppeM ram air//LTW rear spoiler//
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Old Tue, Sep-27-2016, 12:15:29 AM   #9
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Default Re: Reverse grind after clutch hydraulic overhaul

Quote:
Originally Posted by kyrix1st View Post
Update#2: After driving around for a while and occasionally opening brake fluid reservoir to check for air bubbles, clutch feel kind of got firmer and it no longer grinds when I put it in reverse.

I suspect that some of the normal driving sort of got the air out of the master cylinder(having three hoses: two connecting to brake fluid one to slave cylinder) since slave cylinder was said to be "perfectly done" using BMW special tool at the dealership.

My clutch (race clutch+lightweight flywheel) used to engage at about 20-30% off the floor and it feels about the same unlike the first time which immediately engaged as soon as I took my foot off.

I'll keep the post updated. Does anyone have experience with reverse bleeding?
Pumping the clutch a couple hundred times will generally give you an *adequate* bleed.

That said, the ONLY way to get a really good bleed is to do what I described earlier: Pop the slave off the transmission, compress it, and bleed it with the slave hanging down and the bleed screw on TOP.
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[B]2011 BMW M3 (E90) Alpinweiß/Cloth - Slicktop stripper, TCK D/A Konis, AS SSK
2006 GMC Sierra 2500HD 4WD - Duramax LBZ/Allison
2002 BMW M3 Alpinweiß/Black - Konis, AS SSK, JBL MS-62C, IDQ-12v3, JBL MS-8
1999 323i KP/GTS2 Alpinweiß - Hood-in-the-windshield mod
1995 M3 Dakargelb/Black - S50B32/S6S420G, Diffsonline 3.91, H&R/Bilstein, Hotchkis, AS SSK, etc...
1990 325is Brilliantrot/Tan - GC/Bilstein, Sway
1989 325is Alpinweiß/Black - Decontenting...
1989 M3 Alpinweiß/Black - S62B50 in progress...

Hers: 1996 Porsche 911 Turbo Black/Black - UMW LTW Flywheel, Bilstein
Hers: 1988 325iX Coupe Diamondschwartz/Black 5spd - Korman lengthened front driveshaft, 272 cam, H&R/Bilstein

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Old Wed, Nov-16-2016, 05:06:40 PM   #10
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Default Re: Reverse grind after clutch hydraulic overhaul

It actually turned out to be a slave cylinder "rod" that stuck out further than the replacement part which helped to lift the clutch engagement point. Now I could disengage the clutch entirely, no grind after that.
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Front: E31 840Ci Brembo 4P-Endless MX72//
Rear: Stock-Endless CC-RG //
Recaro SPG, SR-2//
Sparco 35cm steering//
Motorsport Style 24 7.5J//GruppeM ram air//LTW rear spoiler//
Hella headlights//
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Discussing Reverse grind after clutch hydraulic overhaul in the E36 M3 (1992-1999) Forum - {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999 at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)