Question about 1994 GMC Sierra

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I have replaced the clutch master cylinder 2 times in the last 8 months any ideas on why this keeps happening

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Sometimes if you use rebuilt master cylinders, you can get unreliable ones

Posted on Sep 08, 2010

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Hi- 1995 jeep wrangler 2.5yj- clutch grinding won't go into gear - seems full of fluid but over filled it works good for a few months -does it again- repeated -works good-maybe master slave problem ?


1995 YJ if still stock all that is ONE PART, see FSM quote below.
is the fluid dropping, day by day, week by week???
y/n?
yes, then either the slave or mc are bad.
sometimes both can fail, (rust happens inside and is progressive)
what I do , is this. (if not wanting to change out both)
1: look at the MC, if it done leak down either side of the fire wall
it might be good (dont mean the piston seals good but its not leaking, so if fluid drops , (every week say) the the MC is ok
and for sure the slave leaks.

2: so where is your slave. have you looked,? (swaps happen)
most leak and can not be detected as that leak landed on the road to work.
for sure its just 2 parts, here, you know the clutch is ok.
because it works with fluid in the system and bled.
now ILL PASTE THE FSM words out of a real factory service manual.
they are clear.
FSM words, QUOTE:
CLUTCH HYDRAULIC LINKAGE REMOVAL
The clutch master cylinder, slave cylinder
and connecting line are serviced as an assembly
only.
The linkage components cannot be
overhauled or serviced separately. The cylinders
and connecting line are sealed units. Also
note that removal/installation procedures for
right and left hand drive models are basically
the same. Only master cylinder location is different.
(1) Raise vehicle.
(2) Remove fasteners attaching slave cylinder to
clutch housing.
(3) Remove slave cylinder from clutch housing (Fig.
9).
(4) Disengage clutch fluid line from body clips.
(5) Lower vehicle.
(6) Verify that cap on clutch master cylinder reservoir
is tight. This is necessary to avoid undue spillage
during removal.
(7) Remove clutch master cylinder attaching nuts.
Note that one nut is accessible from engine compartment
and one nut is accessible from under instrument
panel (Figs. 10 and 11).
(8) Remove clip securing clutch master cylinder
push rod to pedal and slide push rod off pedal pin.
(9) Disconnect clutch pedal position switch wires.
(10) If pedal pin is equipped with bushing, inspect
condition of bushing and replace it if worn or damaged.
(11) Remove clutch hydraulic linkage through engine
compartment.

Dec 02, 2016 | Jeep Cars & Trucks

2 Answers

Clutch pedal occasionally sticks half way down


This problem is caused by the hydraulic clutch master cylinder, you will need to get it replaced, there is no other part that will do this except that cylinder.

Oct 21, 2008 | 1997 Volkswagen Golf

2 Answers

Clutch for a 1993 civic ex


Could be your slave cylinder again,sometimes they don't last long,had one only last 10 months,go check your clutch master cylinder's fluid,if out,then slave cylinder is bad and should show signs of leakage.Another thing it could be if slave cylinder is good,then check the clutch master cylinder.

Nov 28, 2012 | 1993 Honda Civic 4 Door

1 Answer

Cant find the clutch reservoir on my audi a4 1.8 eastate r reg..


The Clutch Master Cylinder is located on the firewall inside the engine bay, and usually next to the brake master cylinder as the brake and clutch pedals are usually very close to one another. The Clutch Master Cylinder is responsible for transferring the clutch pedal pressure hydraulically to the slave cylinder to release the clutch. You can tell when your clutch master cylinder is dying or needs repair when you depress your clutch pedal and it slowly sinks to the floor and does not return. Since the entire system is a hydraulic one, the master cylinder also has a reservoir that holds the fluid used in the clutch hydraulic system. If you decide to change the clutch master cylinder it is a good idea to also get a clutch slave cylinder at the same time, as both units typically fail around the same time. When replacing your master or slave cylinder, its always a good idea to flush your entire system to prevent water buildup or air pockets from being present when you are driving. Also always keep an eye on the fluid in your reservoir, dirty fluid may mean that the internal seals are allowing dirt and contaminants into your master cylinder.

Oct 11, 2011 | 1997 Audi A4

1 Answer

I have a 99 ford F550, and have replaced the clutch on it 3 times in the last 5 months. I do not understand why it keeps going out. This issue has been very frustrating and expensive. Is there an...


many clutch issues and I take it you are referring to a slipping clutch originate in a faulty clutch master cylinder where the compensating port is blocked
if you have not fitted a new clutch master cylinder try that
another thing is that an f550 is a heavy duty truck so clutch work will require a flywheel machining and a heavy duty clutch pressure plate not an every day clutch kit

Jun 23, 2017 | 1999 Ford Super Duty F 550

1 Answer

1995 jeep wrangler 2.5l, 150k From neutral, can not shift directly into 1st gear, I have to slam it kind of hard into 2nd and that allows me to shift easily into first gear. Once moving the shifting is...


it appears from your description that it is a clutch operation problem
in that it is not disengaging properly to allow the clean selection of first gear
that amounts to air in the hydraulic system, faulty slave cylinder or faulty clutch master cylinder
unless you have oil on the clutch plate causing it to stick or a dry or seizing spigot bearing in the flywheel( possible ), there is no report from you about a clutch problem( slipping , shudder smelling hot)
At this point replacing both the slave cylinder and clutch master cylinder would be the fix especially if they have not been serviced since manufacture
take it to an accredited brake /clutch specialist shop for diagnosis /quote
some vehicles have the slave cylinder internal in the bell housing (very bad and repair costly manufacturing idea) and if that is your case , the transmission will have to be removed to replace it
should that happen and as the box will be out , it will be cost effective to inspect the clutch at that time

Apr 01, 2017 | 1995 Jeep Wrangler

2 Answers

Clutch suddenly has no resistance and car won't shift gears. Fluids were low, have put fluid in the reservoir but still doesn't work. How do you bleed a clutch line?


on the transmission there is a slave cylinder that works like a brake cylinder, when you apply pressure to the clutch pedal a rod inside the vehicle under the dash pushes into a clutch master cylinder, (almost like a brake master cylinder without the reservoir, as the clutch master cylinder works off the brake master cylinders reservoir) the plunger in the clutch master cylinder applies fluid pressure to the slave cylinder,(located down on the trans near the clutch fork assembly) which projects a piston rod into the clutch fork dis-engaging the clutch. To bleed the clutch slave cylinder locate the bleeder screw on the slave cylinder,break loose so it loosens and tightens easily. Check fluid in brake master cylinder reservoir,fill if needed, while bleeder on the slave cyl is closed have a helper push clutch pedal to floor and back 7-8 times, (At first the clutch might stay at the floor, just pull it up by hand or foot and continue) after several pumps with no rest time push pedal to the floor and hold down with foot pressure, at this time loosen the bleeder on slave untill fluid leaks out, watch for air bubbles, close bleeder and repeat untill there is no sign of air bubbles, (make sure to check fluid in the brake master cylinder and keep fill as needed, do not let fluid get less than 1/2 empty as it might **** air and you will have to start over) If this does not bring clutch to operate then you need to check if slave cylinder is reachig its full extension of push rod or not. If it is not then you will have to replace the clutch master cyl or the clutch slave cyl or both as seals are bad and wont hold pressure. Or you need to inspect the clutch fork,the throw-out bearing, or the pressure plate fingers and clutch plate for failure or broken bent parts. I hope it turns out to be a easy fix on that clutching thing.

Jan 14, 2011 | 1995 Nissan Pickup

1 Answer

My 1999 pontiac keeps breaking the clutch master cylinder it wont keep the pressure. as soon as u hit the clutch u hear a pierce noise and open it up. and the mastercylinder is destroyed


try replacing both master and slave cylinders at the same time. when both are removed apply brake cleaner and shop air to high pressure line running between master and slave cylinders to clear any possible cloggs. If it happens again remove your transmission and inspect clutch, bearing and linkage in bell housing for broken/binding parts.

Dec 15, 2010 | 2003 Pontiac Sunfire

1 Answer

My 94 gmc sierra 6.5 td keeps blowing the clutch master cylrnder


It needs a clutch pressure plate force is to great do lining & reface flywheel then good to go for a longggggg time

Sep 01, 2009 | GMC Sierra 2500 Cars & Trucks

1 Answer

Hydraulic Clutch Problem in an 82 Toyota Pickup


If you are leaking fluid from the clutch master cylinder then you have air in the system. You could try and bleed the air out of the clutch slave cylinder to get the gears but it would not last. The only way is to replace the defective master cylinder, replace all of the fluid and bleed out the air through the slave cylinder.

Apr 07, 2009 | 1985 Toyota Corolla 2 Door

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