dot4 in when mineral oil needed

[TractorTech]

Definitely causing the brake to not release. The dealers, Tractores Borges or Argo Tractors may have it.

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[kenhar]

Have a Ford 6640 with hydraulic brakes and clutch. Wheel cylinder blew, which is inside the rearend housing. I blocked that cylinder off since the tractor is used very limited. No racing or hi way use. Soon the other break cylinder blew. The mineral oil brake fluid was $28 a quart and had to fill the reservoir about 2 times a week when feeding hay. The mineral oil is used so as not to contaminate the hydraulic and transmission oil in case a wheel cylinder blows. The tractor requires a special additive in the hydraulic oil (134d), so I thought why wouldn't that work instead of the mineral oil. It did. It worked fine for about a week. Then the clutch pedal went to the floor. Clutch and brakes use the same reservoir. That oil ruined both master cylinders. New brake cylinders, both master cylinders, $3000 repair bill, the tractor is back at work. Expensive lesson.

 

[ppea]

I have replaced the seal on the brakes,changed the oil with corect oil,but the brake they are still warming up.These wet brakes is normaly cold or because of axle rotation is fast they became hot?

 

[TractorTech]

Warming up or getting hot? Do they stick still?

 

[ppea]

maybe not that hot like before,but on aprox 1 km on almost top speed ,you can hardly hold your hand on front axle where the disc brake are located.