:confused:ever since i put this thumper cam,my brake pedal gets hard sometimes,i almost ran a stop sign yesterday and hit a car,damm pedal was real hard.it goes and comes.is it cause the vacuum and idle??
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:confused:ever since i put this thumper cam,my brake pedal gets hard sometimes,i almost ran a stop sign yesterday and hit a car,damm pedal was real hard.it goes and comes.is it cause the vacuum and idle??
Time for hydroboost...Quote:
Originally Posted by chevrolade
you need to go hydraboost due to lack of vacuum.
That's wierd because mine did the exact opposite after my cam. I got a vacuum gauge and it went from 22-24 at stock to about 12-15 now (at idle). I hardly have brakes because of it. I'll try searching and see what I can find out.
The vacuum is what makes your pedal feel softer, it assist's in pushing the master cylinder in when you press the pedal. If there isn't enough vacuum to assist then the pedal feels hard and is alot harder to press due to the booster not helping out...it's like having manual brakes.
no way i dont want to switch to hydroboost ,i rather switch the cam lol
IMO hydroboost is way better than a booster. Especially if you have upgraded heavier wheels and tires than stock. And hydroboost is cheap and easy to install.Quote:
Originally Posted by chevrolade
if i were to do hydrooost,cause i mite if i wanted to bag it,but i would need all the components from a 2500 right??
Yep..all you need is the unit, two lines, and a tee to tie in the return...super easy...Quote:
Originally Posted by chevrolade
use everything from a 3/4 ton but get thebooster from an escalade it will have the studs in the right place. the hds have one in a an odd place so extra work. im in the process of acquiring parts to convert mine because i have no vacuum in my truck at low idleQuote:
Originally Posted by chevrolade
That's not opposite that's the exact same. Bigger cams with more duration/lift/overlap cause low idle vacuum and stiff vacuum assist brakes.Quote:
Originally Posted by 1_fastsilverado
Or a Denali like mine...it has hydraulic assist too. The downer from this system is that on low speed maneuvers where you use a lot of steering input and a lot of brake application none of it works that great because your strapping the pump. There may be different pump options.Quote:
Originally Posted by ss wrecker
Or, you can install a vac canister to store vac when you're not needing it for brakes.
We put a healthy cam in my brothers 4.8L, he would have lost brakes if it wasn't for this device that is on the booster. It's a 9" or so electric canister that turns on when the vac is low. It's never come on before, it's never had to, but now it turns on and off, kind of neat on a stock truck.
His is an 04 4.8L longbed, like a work truck, so that's why it probably has one.
Also, my '05 avalanche has hydrb., that's another donor truck you can pick from.
later,
allen
That electric pump was one year only. There were problems with them and the diagnostics were half baked. They are kinda cool though. The swap problems come into play when you realize the booster on these is different for the pressure/vacuum sensor provision and the system requires module control of the pump. It's a benefit for the owners that already have one but I'm not sure someone would want to swap one in. However there are aftermarket electric pump kits as well as reserve canisters.
A friend of mine has a 1200 hp 59 impala . He has a vacuum pump,from Summit i think, It stops great!!