brake flaw i nthe late 70's K5s?

[wazzabie]

"That model had a fatal flaw with the difficulty in braking when the engine vaccume wasn't being suplied to the brake booster, you literaly had almost no brakes at all."

any truth to this in the 70's k5?

 

[KansasTwister]

ive seen that footage before, it was played in fast forward i believe, and i dont remember the narrative, but i do remember it was a woman driving. And storyline doesnt sound right either.

 

[lectric80]

This had nothing to do with any so called fatal flaw, and it has been discussed at length on here on CK5. I believe that the owner was a member here, or at least that someone here knew them.

 

[wazzabie]

Just wondering if K5s in general have this flaw. Not so interested in the video as yeah it has been seen a lot. I had the K5 lose breaks on me also once.

 

[lectric80]

The booster increases the pressure on the master cylinder, but without boost you still have brakes. You have to apply a lot more force to engage the brakes but no single system failure is supposed to cause a complete loss of brakes. The system is all designed around redundancy, and the booster system is no different.

Edit: If you want to see what it does without a booster, pump the brakes a few times after you shut the engine off. The brake pedal will get extra stiff because you don't have that vacuum or hydraulic pressure to increase your foot pressure on the master cylinder. This means you have to apply all the force required to push the fluid through the lines and engage the brakes, with a booster the pressure required by you is much less, but it is still a direct mechanical linkage to the master cylinder. Vacuum boosters are easier to do this with than hydroboost systems.

 

[owenst7]

Typical idiots that post on YouTube. The only way for any conventional brake system to fail like that is for a huge pressure leak like a failed line or caliper or something. Course even then, you'd have brakes on the other axle because the axles use their own reservoirs. Out of all the atvs, import cars, medium duty trucks, etc, they all have essentially the same components. There's nothing on a 70s GM that's any different from a car, truck, go kart, etc. Other than hydroboost, but that improves braking and runs it off the power steering pump, which is generally the most reliable component of any vehicle.