what causes the clutch pedal to be soft
TS-04, Troubleshooting - Clutch
Introduction
This troubleshooting guide is intented to aid identify and repair problems with the clutch system. The post-obit is a list of problem symptoms discussed in this guide:
- Clutch pedal travels to floor with little or no resistance
- Clutch pedal feel soft when depressed
- Unable to engage manual into gear
- Clutch slips
- Clutch grabs or shudders as it is engaged
- Racket or vibration coming from the surface area of the clutch
944 CLUTCH HYDRAULIC System
944 CLUTCH CONTROLS
Clutch pedal travels to flooring with little or no resistance
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| Clutch master cylinder or slave cylinder is bad. | The primary or slave cylinder can fail due to an internal or external seal leak. The most mutual seems to be external seal leakage. Audit the clutch master cylinder and slave cylinder for leakage and rebuild or replace if leaking. One cheque y'all can perform on the primary cylinder is to depress the clutch pedal while someone watches the brake fluid reservoir level. If the level rises while the clutch pedal is being depressed, The clutch master cylinder is bad and should be rebuilt or replaced. | CLUTCH-04 CLUTCH-02 |
| Leaking hose or plumbing equipment. | Check the status of the hose from the brake fluid reservoir to the clutch master cylinder (leakage). Bank check for leakage from the fittings at the clutch master cylinder and the line from the clutch master cylinder downwards to the slave cylinder. | N/A |
| Fluid in brake reservoir has dropped beneath the level of the hose going to the clutch principal cylinder. | Fill the restriction fluid reservoir and drain clutch if it feels spongy after filling. | CLUTCH-02 |
| Broken clutch relese lever | Difficult to check just may exist able to check by looking at the end of the relese lever in the round opening in the clutch housing. Try pushing on the end of the lever with a screwdriver. If it moves easily the release lever may exist broken requiring replacement. | North/A |
Clutch pedal experience soft when depressed
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| Air in the organization. | Normally a soft or spongy feel to the clutch when the pedal is depressed is the outcome of air in the system. Often this is acquired by the brake fluid reservoir dropping beneath the level of the hose which goes from the restriction reservoir to the clutch primary cylinder. And so, bank check the brake fluid level and fill if necessary. Then drain the clutch using CLUTCH-02. | CLUTCH-02 |
Unable to engage transmission into gear
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| Bad clutch disc | There's not really any mode to decide positively that the clutch disc is bad. However, if y'all can non engage the transmission into whatever gear with the engine running but, can engage information technology into gear with the engine shutdown., that's a good sign that either the clutch disc or pressure plate is bad. You tin can get some indication of the status of the clutch past performing a clutch disc clothing cheque (CLUTCH-03). Replace clutch (CLUTCH-01). | CLUTCH-03 CLUTCH-01 |
| Bad pressure plate | Like the clutch disc, at that place's not actually whatsoever fashion to decide positively that the pressure level plate is bad. Once again, if you tin can not engage the manual into whatsoever gear with the engine running but, tin can engage it into gear with the engine shutdown., that's a expert sign that either the clutch disc or pressure plate is bad. Supercede clutch (CLUTCH-01). | CLUTCH-01 |
| Transmission or shift linkage bad | Refer to TS-05, Troubleshooting - Transmission Transmission | TS-05 |
Clutch slips
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| Bad clutch disc | The clutch disc can be worn or if the clutch disc is contaminated it will slip. The clutch disc can become contaminated by oil if y'all take a rear chief oil seal leak. It can become contaminated by coolant if you have a leaking coolant hose at the dorsum of the engine compartment. Check for oil and coolant leaks around the back of the engine. Look for signs of oil or coolant coming out of the bottom of the clutch housing. Check clutch disc article of clothing using CLUTCH-03. Replace clutch disc if there are signs of contamination or if the wear check is bad (CLUTCH-01). | CLUTCH-03 CLUTCH-01 |
| Pressure plate or flywheel warped. | If the flywheel or pressure plate are warped, the pressure plate will not have enough clamping forcefulness to keep the clutch disc pressed against the flywheel. In that location'due south really now way to check for this without disassembling the clutch and inspecting the flywheel and pressure plate. | CLUTCH-01 |
| Clutch disc overheated. | During heavy clutch usage (i.e. at the track), the clutch disc tin become overheated causing it to slip. If you think that may be the case, allow it to cool for an hour or so and the clutch volition likely cease slipping. | North/A |
Clutch grabs or shudders as it is engaged
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| Clutch disc contaminated | A contaminated clutch disc can cause the clutch to grab, shudder, or even slip. Check for oil and coolant leaks effectually the back of the engine. Look for signs of oil or coolant coming out of the bottom of the clutch housing. Supplant clutch disc if there are signs of contamination (CLUTCH-01). | CLUTCH-01 |
| Driver induced shudder. | Sometimes the way a car is driven tin can cause the clutch to be grabby or induce the shudder. In that location are basically ii different types of drivers with regards to clutch operation. Those who feather the clutch and those who jab the clutch. Those who jab the clutch get on and off the clutch pedal very speedily when changing gears. Over fourth dimension, this will tend the make the clutch grabby. Someone who feathers the clutch engages and disengages the clutch slowly. So, if y'all're 1 who normally feathers the clutch and you lot arrive a machine that's normally driven by someone who jabs the clutch, y'all'll likely notice a shudder when you engage the clutch. The advantage to gettting on and off the clutch quickly is that information technology normally extends the life of the clutch by reducing the amount of wear. | Northward/A |
| Warped pressure plate or flywheel. | Again, in that location's really no style to cheque for this without disassembling the clutch and inspecting the pressure plate and flywheel. | CLUTCH-01 |
| Worn splines on clutch disc. | In that location'due south really no way to cheque for this without disassembling the clutch and inspecting the clutch disc. | CLUTCH-01 |
Noise or vibration coming from the surface area of the clutch
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| Bad release begetting or airplane pilot bearing | Excessive noise from the clutch surface area tin be caused by a bad release bearing or pilot bearing. The clutch assembly must be disassembled to supercede the bearings. | CLUTCH-01 |
| Pressure plate bad.. | A broken sping in the pressure level plate can cause excessive dissonance and vibration. Supercede clutch. | CLUTCH-01 |
| Clutch disc bad. | A broken spring in the clutch disc or a bad prophylactic centered clutch diaphragm can cause excessive vibration and racket. Only ordinarily-aspirated 944s were equipped with the rubber centered clutch disc. Nigh people now days replace the condom centered disc with the bound centered clutch discs when the clutch requires replacing. | CLUTCH-01 |
Clark's Garage � 1998
Source: https://www.clarks-garage.com/shop-manual/ts-04.htm
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