Brake Fluid Reservoir

[92'M998]

Hi -

I checked the brake fluid and are both portions supposed to be full? Also the M998 uses SBF, correct?

Thanks in advance.

 

[Coug]

Near full, depending on brake wear. The more the brakes are worn the lower it will be, and I don't know the lower limit, but as long as it's near the top you should be good.
And yes, Silicon Brake Fluid only (DOT5) unless you've completely flushed out the system and using DOT3 or 4 (which people occasionally do, but very uncommon)

 

[92'M998]

Near full, depending on brake wear. The more the brakes are worn the lower it will be, and I don't know the lower limit, but as long as it's near the top you should be good.
And yes, Silicon Brake Fluid only (DOT5) unless you've completely flushed out the system and using DOT3 or 4 (which people occasionally do, but very uncommon)

 

[92'M998]

Great. yes, I will use SBF as it has not been flushed. Thanks C!

 

[Mogman]

WHAT IN THE WORLD WERE "THEY" THINKING WHEN "THEY" CAME UP WITH DOT 5.1 BRAKE FLUID??????

 

[Coug]

WHAT IN THE WORLD WERE "THEY" THINKING WHEN "THEY" CAME UP WITH DOT 5.1 BRAKE FLUID??????

I didn't even know there was a 5.1. Now that I've looked it up, whoever did it can go to heck.

 

[Milcommoguy]

Well for one... it does not absorb moisture and rust the system from the inside out. Who has time to be rebuilding DOT 3 /4 system on a fleet of trucks and trailers? Don't get confused with DOT 5.1 just cuz it sounds like DOT 5.

DO NOT MIX Dot 5 with any other Dots or stand by for a mess or failure. Ask my daughter....

When she was using the cool camo CUCV (DOT5) to school and back, The auto shop boy's talked her into a peek under the hood. Shop boy's not paying attention to ??? topped off the master cylinder. Three days latter... Daddy the brake light keeps coming on and it hard to stop. Ok, Let's check it out. I know my rigs and after going over it, IT came to light (no pun) I had some little helpers down at the HS. Daddy wasn't a happy camper.

ONLY DOT 5 for me, CAMO

 

[Mogman]

DOT 5.1 is a Glycol based fluid like DOT 3-4, why in the world would they call it 5.1 it makes no sense at all, it has a higher boiling point than DOT 4, they could have called it DOT 6.
You want to really screw things up fast put DOT 3 in a DOT 2 vehicle, DOT 2 is a caster oil based fluid, found out the hard way in the early 70s with my Triumph GT-6

 

[Hummer Guy]

Near full, depending on brake wear. The more the brakes are worn the lower it will be, and I don't know the lower limit, but as long as it's near the top you should be good.
And yes, Silicon Brake Fluid only (DOT5) unless you've completely flushed out the system and using DOT3 or 4 (which people occasionally do, but very uncommon)

Mines is near full but the brake pedal is very stiff, should I remove some?

 

[Mogman]

Mines is near full but the brake pedal is very stiff, should I remove some?

no. it should be nearly full

 

[Mogman]

Mines is near full but the brake pedal is very stiff, should I remove some?

What do you mean when you say the pedal is "stiff" ?? do you have to reach down and pull it back? or do you mean it takes allot of pressure to apply the brakes???

 

[Hummer Guy]

What do you mean when you say the pedal is "stiff" ?? do you have to reach down and pull it back? or do you mean it takes allot of pressure to apply the brakes???

No, the brake is extremely sensitive, soon when you touch it, it brakes very hard and the pedal barely goes down any

 

[Maxjeep1]

No, the brake is extremely sensitive, soon when you touch it, it brakes very hard and the pedal barely goes down any

Haha when I first started driving mine I would lock the brakes every time I stopped. Best brakes I have ever had on anything. After a few hundred miles it seems normal.

 

[Hummer Guy]

Haha when I first started driving mine I would lock the brakes every time I stopped. Best brakes I have ever had on anything. After a few hundred miles it seems normal.

Oh didn't think that was normal lol, its going to take some getting use too, my colorado and deuce has to go down quite a bit to stop lol

 

[Coug]

we've become spoiled with modern anti-lock brakes and all the fancy electronics in modern vehicles.
On an empty truck, due to how the brake system is proportioned, it's very easy to lock up the rear wheels until you get used to them. The brake system is set up for optimal braking with full load, so empty there just isn't the weight over the back wheels necessary for them to keep spinning when they're receiving more braking power than the front are.