Question about Mazda B-Series Truck

1 Answer

I have a B2500 that has recently had a clutch, pressure plate and throw out bearing replaced. Also the master cylinder for the clutch has been replaced. Every so often the truck becomes hard to shift unless I pump the clutch. Sometimes the cap on the reservoir for the master cylinder is tight, like there is a vacuum. Sometimes opening this reservoir causes the vacuum to leave and the clutch to operate normally. Sometimes the clutch master must be bled. A local shop told me to check the end of the rod going up from the clutch pedal to see if it was wet. It's very dry. Also they suggested I remove the inspection cap to look at the slave cylinder, it was also very dry. I can't find any leaks. Always either removing the cap lets it work or bleeding the master cylinder will do it(done this on the darn roadside cause I can't figure out what else to replace). Does anyone have any clue as to what's wrong? Thanks

Posted by on

  • surrealistic Aug 01, 2008

    Thanks for the reply. Do I check that where the pedal attaches to the rod or under the rubber down next to the master cylinder?


    Thanks!

×

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that gotĀ 5 achievements.

    Governor:

    An expert whose answer gotĀ voted for 20 times.

    Hot-Shot:

    An expert who has answered 20 questions.

  • Expert
  • 124 Answers

You may have to check the clearance between master cylinder push rod and piston. (just above pedal)
Should be approx .020" or about thickness of hacksaw blade.

Posted on Aug 01, 2008

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Not able to select gears when engine is running,but when off selects easy,after fitting a new kit still does the same


The clutch is not releasing , several things can be the cause, check the following , Throw out bearing same size,clutch driven plate not fitted back to front, clutch fork is fitted to throw out bearing housing and pivot mounting, is the slave cylinder rod the same length, has the clutch free play been adjusted, has all air been bled from the master cylinder, If cable operated has free play been adjusted. Has the new pressure plate the same throw as the old one.

Jul 02, 2016 | Cars & Trucks

2 Answers

Clutch stays down. Slowly will take of with clutch fully pressed. Does not slip.dont understand


It sounds as though the clutch pressure plate has become weak.

When you press the clutch pedal the release/throwout bearing presses against the centre of the clutch pressure plate. This causes the metal 'fingers' -the springs- on the pressure plate to flex and release pressure on the driven plate - momentarily disconnecting the drive from engine to gearbox.

The link below is of generic clutch images
how clutch works Google Search

A weak pressure plate isn't fully releasing the driven plate. If you're going to do any replacing of parts - a clutch should be replaced in 3 units: Pressure plate, driven plate and release/throwout bearing.

May 05, 2016 | Cars & Trucks

1 Answer

Hi i just put a new master cylinder a month back now today my clutch felt hard and when i put it in reverse heard a broken sound clutch went flat and oil came from the master what can the problem be


Umm...

A mechanical 'breaking noise' doesn't sound good. It's hard to diagnose a problem online without being there to see/hear the vehicle. But .. it may be that your clutch pressure plate has broken/ release/throwout bearing has broken?

It's difficult to see why the master cylinder should leak - unless it was incorrectly fitted in the first place?

Just to check ... The master cylinder is in the engine bay/compartment and is where you top up with clutch fluid. When a master cylinder fails it usually results in no pressure at the clutch pedal, not a leak.

The clutch slave cylinder is the one that does all the work. When you press the pedal hydraulic pressure is sent from the master cylinder to the slave cylinder - which then pushes the release/throwout bearing against the clutch pressure plate and 'disconnects' the driven plate .. allowing you to change gear.

The slave cylinder is the one that does all the hard work - it is located somewhere where engine and gearbox mate together, usually at the bottom right/left. It's usually the one that fails/leaks. It's quite easy to replace..

I don't think it is anything to do with reverse gear. It's more to do with the clutch pedal being depressed - and, I would suspect - something has failed.

The link below is generic images of a clutch:
clutch diagram Google Search

Basically, a clutch is 3 parts. There's the 'pressure plate' which bolts onto your flywheel. The pressure plate is a 'spring'. You depress the clutch pedal and the release/throwout bearing presses onto the centre of the pressure plate causing the 'fingers' - the springs - to bend back and take pressure off the driven plate - which is the link - the drive - between engine and gearbox.

If you have a leak your clutch will not work. This causes a 'grinding/crashing' noise when you try to change gear. The first thing you should do is check where the leak is coming from and do something about it.

The 'noise' that you mention may be due to the fact that the gears are 'grinding' as they try to mesh together without the use of the clutch.

The first thing you should do is check why there's a leak. It's difficult to see why a new master cylinder is leaking unless it was incorrectly fitted and damaged (pipes incorrectly connected..).

If it's the slave cylinder that is leaking - replace it. Easy job.

If Master cylinder and slave cylinder are ok - you have to look at your clutch unit. A clutch is always replaced with 3 parts ... throwout bearing/pressure plate and driven disk.

May 04, 2016 | Cars & Trucks

3 Answers

Can you just replace clutch disc or should you replace the hole clutch it is on Chevy 350


You can replace just the clutch disc. But with the labor involved I recommend replacing the pressure plate and throw out bearing at the same time.

Apr 18, 2016 | Cars & Trucks

1 Answer

I hauled a trailer about 40 miles and when I went to leave the clutch pedal went to the floor no resistance and wouldn't disengage clutch master cylinder has fluid throwout bearing has been making noi


It sounds like the throw out bearing separated. You will want to change the clutch and pressure plate when you replace the throw out bearing.

Aug 18, 2013 | Cars & Trucks

1 Answer

The clutch will not engage properly on my 1988 toyota pickup. Already replace clutch master cyclinder and clutch slave?


There are a couple of possibilities; worn clutch plate, failed pressure plate, possible hanging up of the throw-out bearing. Also, some hydraulic clutches have a throw adjustment on the slave cylinder that may need adjustment after replacing the slave cylinder.
If you plan on more DIY maintenance, I would highly recommend buying a Haynes service manual, you'll find the $25 well-spent:
Toyota pickup manual

Mar 31, 2011 | 1988 Toyota Pickup

1 Answer

Replaced master cylinder in clutch in an attempt to stop the car sticking in gear and moving when foot taken of brake. It still moves while the clutch is still depressed and needs brake to stop...


Sounds like a worn-out clutch plate or broken/damaged throw-out bearing or pressure plate. You need to replace the clutch - including the pressure plate, throw-out bearing, pilot bearing, and I also recommend a new slave cylinder. (Especially since you have allready replaced the master cylinder.) You may want to weigh the pros and cons of having your flywheel machined or just replacing it with a "Remanufactured " flywheel.

Mar 13, 2011 | Volkswagen Golf Cars & Trucks

2 Answers

The clutch is stuck to the floor bord and i cant shift


you may have a faulty clutch master cylinder or faulty clutch slave cylinder- leaking clutch fluid. most of the time both are replaced at the same time which should be recomended by your mechanic, the bolts to the master cylinder are very hard to get to and require the right tool.
you should be able to move car forward by selecting 1st then cranking engine till it starts, gear changes while driving are hard but not impossible. i recommend a tow truck to a local repairer.

Dec 22, 2009 | 1995 Isuzu Rodeo

1 Answer

1992 Ford F250 4x4 7.3 Diesel


those trucks had problems with the fire wall breaking .have some one push the clutch pedle and watch the fire wall from under the hood were the clutch master cylinder bolts too if the fire wall moves u need to buy the repaire kit from ford.

Apr 01, 2009 | 1992 Ford F250

1 Answer

Squeeling noise when pressing the clutch


That noise is coming from the throw-out bearing, its dry and worn needs to be replaced. While you are in there you should do the whole clutch job becuse you need to remove the tranny to change that bearing which consists of Pressure plate,clutch plate throw-out bearing center bearing and resurfacing of flywheel.maybe even a new slave cylinder. Good Luck

Dec 11, 2008 | 2004 Datsun 510

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

225 people viewed this question

Ask a Question

Usually answered in minutes!

Top Mazda Experts

yadayada
yadayada

Level 3 Expert

61249 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

21949 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

6812 Answers

Are you a Mazda Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...