2003 Toyota Prado 6 cyl Four Wheel Drive Manual 133000 miles
Prado 5 dr - normal usage, no off road, town driving average less than 20,000Km a year.
With warning, after using the clutch pedal to disengage, change gear and release, the pedal stays down and must be manually pulled up ( against pressure) to the normal engaged position. Once there it may operate normally for some time or it may again fail as before.
No external leaks
When pedal is on the floor, the clutch is engaged
Happens engine cold and hot
at 85,000 Km first occurence of problem. Dealer changed fluid and it worked fine until 109.000 Km when exactly the same symptoms occurred. The dealer changed the master cylinder and it worked fine until 133,000 Km when after a written compliant copied to Toyota they also looked at it and determined :
Changed Master Cylinder again (no problem since now at 135,000)
Said " the clutch mechanism ( mechanical) is causing vibrations in the master cylinder seals so that they fail : recommendation Change all the mechanical clutch system ! (NOTE NO clutch problems of any kind apart from the pedal sticking down have been evidenced)
I have a problem with that clutch changeout answer as it doesnt make much sense to me ( apart from having to buy a new hi $$ clutch system from the dealer )
I think the fluid in the master cylinder is bi-passing the seals for some reason and hydraulically locking the cylinder until it can be mechanically pulled back to the correct position and displacing the fluid back to the high pressure side.
If it were the slave cylinder sticking would it cause this symptom? ( Note no leaks and a recovery of normal operation after the pedal is pulled back)
Do you have any other suggestions as to what is happening and more particularly why the repeated frequency of the problem at about 25,000KM average.
Would fluid be required to be changed before 25,000 Km in normal circumstances? ( Dealer says good for 40,000KM)
Could fluid contamination cause this problem? (No-one touches the fluid between 25,000 km events )
Sunday, September 26th, 2010 AT 11:47 AM