How to diagnose clutch master or slave? - ZR-1 Net Registry Forums

conesare2seconds · 10-02-2016

Hi everyone. I could use some pointers, please, on diagnosing a clutch hydraulic problem.

I had the car out of the garage late this afternoon, replaced all the Bose amps. Went to take a short drive and found the clutch pedal was down and the take up point was at the floor. Holding the pedal down made it worse; I lost pedal trying to get the trans out of first and into reverse.

I left it in neutral and was able to get pedal back after a few seconds of idling in neutral. Pumping the pedal got enough action back to drop her in reverse to reposition the car then into first to put her back in the garage. It was nearly dark and I could get eyes on the clutch reservoir.

Is there a differential diagnosis process that will help me figure out whether the master or slave is bad? I'll move the ECU and check the reservoir. If the reservoir is empty, I think that'll point to a possible leaky slave. If full, I'd think bad master. Any advice would be received with gratitude.
Tom

GOLDCYLON · 10-02-2016

Most of us replace both at the same time to rule out one or the other. Take a look at the slave on the side of the transmission if it's wet and leaking I would replace it. The clutch master prob has an internal leak based upon the symptoms you are describing.

10-02-2016	#1
conesare2seconds Join Date: Jul 2016 Location: Greater St. Louis Posts: 484	How to diagnose clutch master or slave? Hi everyone. I could use some pointers, please, on diagnosing a clutch hydraulic problem. I had the car out of the garage late this afternoon, replaced all the Bose amps. Went to take a short drive and found the clutch pedal was down and the take up point was at the floor. Holding the pedal down made it worse; I lost pedal trying to get the trans out of first and into reverse. I left it in neutral and was able to get pedal back after a few seconds of idling in neutral. Pumping the pedal got enough action back to drop her in reverse to reposition the car then into first to put her back in the garage. It was nearly dark and I could get eyes on the clutch reservoir. Is there a differential diagnosis process that will help me figure out whether the master or slave is bad? I'll move the ECU and check the reservoir. If the reservoir is empty, I think that'll point to a possible leaky slave. If full, I'd think bad master. Any advice would be received with gratitude. Tom Last edited by conesare2seconds; 10-02-2016 at 11:57 PM.

10-02-2016	#2
GOLDCYLON Join Date: May 2007 Location: Peoria, AZ Posts: 9,153	Re: How to diagnose clutch master or slave? Most of us replace both at the same time to rule out one or the other. Take a look at the slave on the side of the transmission if it's wet and leaking I would replace it. The clutch master prob has an internal leak based upon the symptoms you are describing. __________________ GOLDCYLON - 91 ZR-1 #2014 GOLDCYLON - 90 ZR-1 #2794, 4L60e (Formerly Schrade's) GOLDCYLON - 11 CTS-V Arizona State Director 91 WHITE/BLACK #2014. 380 P&P&PCed,Ported Heads, Jeal Long tubes, Corsa Exhaust/FIKSE FM-5s /LED TLs, LED Headlights, Front Wilwood 6 piston narrowlite calipers and rear Wilwood caliper street shop mod,CNCed Coolant Pipes,TPI Cvr,Filter cover,Stainless Bolts, DRM/DOM PROM /ZFDOC mod build #102,DRLs,BMAD with stainless Debris Screen,Coplan Air Blaster, Pioneer APP Radio 4,Brey-Krause HB,Sub Bar,Fire extinguisher seat mount,DRM Coilovers,LEDs everywhere,Compass mirror (orange),V1 DIC hidden display, Homelink sun visor, Carbon Fiber top x3 and APSIS Carbon Fiber interior, APSIS CF Steering Wheel/NAPA Leather, Banski trailing arms, Guldstrand front suspension,urethane bushings from Prothane (total suspension) ZFDoc drive shaft safety loop, raptor shift light (orange),AO engineering louver front plate, Console seat cushion, 96CE seats with black custom Sheepskins, ss billet catch can,Viper remote entry/alarm,Cragar Rear Louvers,LED side louver lights, Dewitts Radiator with SPAL fans and a Woods 160 T-Stat 90 RED/BLACK #2794. 4L60e Automatic Stage V by RPM Transmission, TCI Dedicated TCM, OBX Stainless Headers, Corsa Exhaust, SAN Secondaries and Haibeck PROM, Exotic Muscle Coil overs, LED Interior Lights, LED Tail Lights, LED Headlights, 94 Sport seats with black custom Sheepskins , Cragar rear louvers, GS Front calipers, Banski Trailing arms, APSIS Carbon Fiber steering wheel, Front and Rear Baer Eradispeeds, DRLs, Guldstrand front suspension,urethane bushings from Prothane (total suspension), Dewitt's Raditor with Dual SPAL fans and a Haibeck 170 T-Stat 11 RED/GREY CTS-V