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#1 |
Registered Member
Join Date: Jun 2000
Location: Saudi Arabia
Posts: 130
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![]() The brake was too light when pushed, that's means time of MASTER CYLINDER to change. The car ruining perfect in this time.
Now, the brake is too hard when pushed (like rock) & at the same time car start serious bucking problem & idle dropped down to 500-600 rpm, my friend tolled me this is because the BOOSTER damaged. He pulls the vacuum line that's connected at the top of the BOOSTER & close the line by his finger, the car idle good no miss up. Did the BOOSTER or the MASTER CYLINDER cause the car to miss up ?
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94 COBRA # 926/5009 TFS track heat heads (ported), Cobra intake (ported), 24# Injectors, 3/8" Phenolic spacer, CompCamsXteremeEnerge 224 232 555'' 565 112, CompCams Pro-Magnum 1.6 RR, BBK 1 5/8" headers, BBK 65mm TB, Pro-M 80mm MAS, Next Generation PIH kit w/ A9L computer, 3.55, BBK 190 lph fuel pump, Paxton fpr, MSD'S, March Pulley's, Pro-5 tower power shifter, Intellitronix Air/Fuel gauge, Eibach Sportline Springs, Tokico 5-way adjustable, Granatelli Motorsport Subframes, Edelbrock Mufflers, 2.5" exhaust system, Pfgoodrich comp T/A drag. Previous Mode: E303 Cam, TFS 1.7 rr '92 Integra LS. |
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#2 |
Registered Member
Join Date: May 1999
Posts: 5,246
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![]() Your master cylinder has nothing to do with vacuum. It's your power brake booster. I've seen the problem before, forget passing emissions if you have them until you replace the booster.
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#3 |
Registered Member
Join Date: Jun 2000
Location: Saudi Arabia
Posts: 130
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![]() does the booster make the car bucks & hesitate & idle to drop to 500-600 rpm ????
why its related to emission !! |
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#4 |
Registered Member
Join Date: Feb 1999
Location: Utica, Michigan
Posts: 2,631
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![]() The booster can leak internally. Remember, it operates on engine vacuum.
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#5 |
My poor 79 RIP
Join Date: Oct 2001
Location: Suisun City,
Posts: 2,320
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![]() I agree, it's the booster.
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'84 mustang GT turbo '85 LTD '89 Camaro Irocz z28 '94 Lightning '96 Trans am |
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#6 |
Registered Member
Join Date: May 1999
Posts: 5,246
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![]() If the booster is leaking vacuum, your computer will read the low vacuum as open throttle and inject more fuel.
Last edited by Unit 5302; 01-19-2002 at 11:26 PM.. |
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#7 |
Registered Member
Join Date: Jun 2000
Location: Saudi Arabia
Posts: 130
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![]() that's why I smell unburned fuel.
can be the booster repaired ? |
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#8 |
Registered Member
Join Date: Feb 1999
Location: Utica, Michigan
Posts: 2,631
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![]() No, just replaced. Try plugging the vacuum line that goes to the booster, and driving the car. If the driveability problem goes away, you've found the culprit.
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#9 |
Junior Member
Join Date: Mar 1999
Location: Ventura, California
Posts: 8,981
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![]() The booster's diaphram is damaged, and the booster needs to be replaced. The damaged diaphram will result in a vacuum leak, which will cause the engine to idle rough, and will make it very difficult to use your brakes. I suppose someone somewhere rebuilds boosters, but I've never known them. Just replace it.
Take care, -Chris
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Webmaster: Rice Haters Club Jim Porter Racing Peckerwoods Pit Stop Support Your Local
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#10 |
My poor 79 RIP
Join Date: Oct 2001
Location: Suisun City,
Posts: 2,320
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![]() Some places do repair them, but it costs more then buying a new one. Makes no sence to me.
__________________
'84 mustang GT turbo '85 LTD '89 Camaro Irocz z28 '94 Lightning '96 Trans am |
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#11 |
Registered Member
Join Date: Jun 2000
Location: Saudi Arabia
Posts: 130
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![]() Is there any difference in brake booster betwwen COBRA & GT ?
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#12 |
Junior Member
Join Date: Mar 1999
Location: Ventura, California
Posts: 8,981
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![]() Not that I'm aware of.
Take care, -Chris
__________________
Webmaster: Rice Haters Club Jim Porter Racing Peckerwoods Pit Stop Support Your Local
RED & WHITE! |
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#13 |
Being stroked is great
Join Date: Oct 1998
Location: Alberta, Canada
Posts: 772
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![]() Yes there is a difference in boosters.
Check out this webpage, #5 Brake Booster Upgrades http://www.geocities.com/mjbobbitt/mustang/brakes.html |
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#14 |
Registered Member
Join Date: Jun 2000
Location: Saudi Arabia
Posts: 130
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![]() BENDIX make the Brake Booster for Ford, I checked their site & I found that Cobra & GT have the same part no.
Last update: BENDIX make the Brake Booster for Ford, I checked their site & I found that Cobra & GT have the same part no ![]() www.bendixbrakes.com |
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