Brake booster

mpdxtreme
Full Member

Posts: 1,032

Location: Arlington TN

Brake booster Jul 3, 2015 8:11:59 GMT -6 via mobile

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Post by mpdxtreme on Jul 3, 2015 8:11:59 GMT -6

Having brake issues on my Toyota. Thought it might be that the master cylinder was to small and not moving enough fluid so I changed from a 15/16 bore 4Runner master cylinder to one for a 1 ton Chevy truck, 1 1/2 inch bore. Well the pedal feels exactly the same. Like I have no power assist. Getting vacuum to the booster and the booster is "supposed" to be a rebuilt one from rock auto.

I've never had a car that the booster went bad in so what does the pedal feel like when a booster goes bad?

My brakes is my last big issue that needs straightening out on my truck. With 4 piston calipers in the front and Monte Carlo calipers in the rear this thing should throw me through the windscreen when I hit the brakes.

Greg G

83 cookie cutter Toyota with some stuff

Greg Gaddy
Arlington TN

mpdxtreme Full Member Posts: 1,032 Location: Arlington TN	Brake booster Jul 3, 2015 8:14:03 GMT -6 via mobile Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by mpdxtreme on Jul 3, 2015 8:14:03 GMT -6 Here's the new master cylinder mounted up. The thing in front is a proportion inc valve for the rear disc brakes. GG
	83 cookie cutter Toyota with some stuff Greg Gaddy Arlington TN

06blackmax Full Member Posts: 1,840	Brake booster Jul 3, 2015 17:37:36 GMT -6 via mobile Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by 06blackmax on Jul 3, 2015 17:37:36 GMT -6 My experience when a booster goes bad the pedal is hard with no movement. If you unhook the vac. line does it change anything?
	Tim My Rig: '12 Wrangler JKU Tow Pig: '11 D-Max 3500 CC 4x4

mpdxtreme Full Member Posts: 1,032 Location: Arlington TN	Brake booster Jul 3, 2015 19:28:38 GMT -6 via mobile Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by mpdxtreme on Jul 3, 2015 19:28:38 GMT -6 Jul 3, 2015 17:37:36 GMT -6 06blackmax said: My experience when a booster goes bad the pedal is hard with no movement. If you unhook the vac. line does it change anything? Haven't tried that. I will tomorrow.
	83 cookie cutter Toyota with some stuff Greg Gaddy Arlington TN

mike
Founder

Posts: 5,790

Location: Nesbit

Brake booster Jul 5, 2015 19:55:40 GMT -6 06blackmax likes this

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Post by mike on Jul 5, 2015 19:55:40 GMT -6

yep the pedal will be hard when the booster is bad. you might want to try changing the hose to the booster. They can go bad and the inside layer of the hose will collapse and cause it to not get vacuum to the booster.

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Post by mpdxtreme on Jul 3, 2015 8:11:59 GMT -6

Post by mpdxtreme on Jul 3, 2015 8:14:03 GMT -6

Post by 06blackmax on Jul 3, 2015 17:37:36 GMT -6

Post by mpdxtreme on Jul 3, 2015 19:28:38 GMT -6

Post by mike on Jul 5, 2015 19:55:40 GMT -6

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