clutch pedal freeplay changing by itself
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From: Cheyenne,WY
clutch pedal freeplay changing by itself
So I just replaced both the master and slave cylinder with brand new ones on my 87 TII. I have a braided line between the two and my pedal freeplay changes with the temperature of the clutch. When it is cold the freeplay is a little more than I like and it engages a little close to the floor. Now when the clutch warms up the freeplay is almost completely gone and it engages almost all the way out. I even used Valvoline synthetic DOT 4 brake fluid. Any suggestions ? Maybe still have more air to bleed out ? I don't know I'm stumped.
Dunno if this matters here but did you BENCH BLEED the master cylinder? I just replaced my master and slave cylinders(kept the steel line) and could not get it up to pressure without removing and bench bleeding the master cylinder. Now it feels perfect.
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Originally Posted by boostedfc3s
So I just replaced both the master and slave cylinder with brand new ones on my 87 TII. I have a braided line between the two and my pedal freeplay changes with the temperature of the clutch. When it is cold the freeplay is a little more than I like and it engages a little close to the floor. Now when the clutch warms up the freeplay is almost completely gone and it engages almost all the way out. I even used Valvoline synthetic DOT 4 brake fluid. Any suggestions ? Maybe still have more air to bleed out ? I don't know I'm stumped.
Just a quote from "How Stuff Works.com" about brake fluid for the benifite of posterity:
What are the different types of brake fluid?
The issues specifications for brake fluid. The three main types of brake fluid now available are DOT3, DOT4 and DOT5. DOT3 and DOT4 are glycol-based fluids, and DOT5 is silicon-based. The main difference is that DOT3 and DOT4 absorb water, while DOT5 doesn't.
One of the important characteristics of brake fluid is its boiling point. Hydraulic systems rely on an incompressible fluid to transmit force. Liquids are generally incompressible while gases are compressible. If the brake fluid boils (becomes a gas), it will lose most of its ability to transmit force. This may partially or completely disable the brakes. To make matters worse, the only time you are likely to boil your brake fluid is during a period of prolonged braking, such a drive down a mountain -- certainly not the best time for brake failure!
As a DOT3 or DOT4 brake fluid absorbs water, its boiling point decreases. It can absorb water from the air, which is why you should avoid opening your car's brake fluid reservoir. For the same reason, you should always keep containers of brake fluid tightly sealed.
DOT5 fluid does not absorb water. This means the boiling point will remain relatively stable, but it also means that any water that does get into your brake system will tend to form pure water pockets, which could cause brake corrosion.
Two other important things about brake fluid: DOT3 and DOT4 eat paint, so don't spill it on your car. Also, none of the different types of brake fluid should be mixed. They can react badly with each other and corrode your brake system.
The issues specifications for brake fluid. The three main types of brake fluid now available are DOT3, DOT4 and DOT5. DOT3 and DOT4 are glycol-based fluids, and DOT5 is silicon-based. The main difference is that DOT3 and DOT4 absorb water, while DOT5 doesn't.
One of the important characteristics of brake fluid is its boiling point. Hydraulic systems rely on an incompressible fluid to transmit force. Liquids are generally incompressible while gases are compressible. If the brake fluid boils (becomes a gas), it will lose most of its ability to transmit force. This may partially or completely disable the brakes. To make matters worse, the only time you are likely to boil your brake fluid is during a period of prolonged braking, such a drive down a mountain -- certainly not the best time for brake failure!
As a DOT3 or DOT4 brake fluid absorbs water, its boiling point decreases. It can absorb water from the air, which is why you should avoid opening your car's brake fluid reservoir. For the same reason, you should always keep containers of brake fluid tightly sealed.
DOT5 fluid does not absorb water. This means the boiling point will remain relatively stable, but it also means that any water that does get into your brake system will tend to form pure water pockets, which could cause brake corrosion.
Two other important things about brake fluid: DOT3 and DOT4 eat paint, so don't spill it on your car. Also, none of the different types of brake fluid should be mixed. They can react badly with each other and corrode your brake system.
The master cylinder was rebuilt 2 weeks ago using spare from the parts car and a Mazda rebuilt kit. A new SS line was also installed. Fluid was flushed from system and replaced with fresh DOT 3 fluid. The only thing left is the slave and it was rebuilt last year. I am going to bleed it again and see if that will help, but that will be next weekend, to busy today.
Originally Posted by T2 vert
The master cylinder was rebuilt 2 weeks ago using spare from the parts car and a Mazda rebuilt kit. A new SS line was also installed. Fluid was flushed from system and replaced with fresh DOT 3 fluid. The only thing left is the slave and it was rebuilt last year. I am going to bleed it again and see if that will help, but that will be next weekend, to busy today.
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