Bro, honestly your understanding is different from what I know.
There are overlap usage of terms of "brake booster". For clarity, brake booster refers to this:
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Vacuum assist pump(aka the 2014 model brake booster) refers to this:
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How brake booster worksHow vacuum pump worksBelow are the comparisons:
- Our EB with or without vacuum pump, are only vacuum assisted hydraulic, not electronic.
- With or without vacuum pump, if there is vacuum leak, after several succession of brake pressing, the pedal will become hard and no braking power. Again, when this happens, you have a weak brake because something is wrong.
- Difference with or without vacuum pump, is the feel of 'hardness' when pressing brake. But, doesn't cause lose of braking power.
- When aircon is on full power, it means the aircon compressor and alternator are both loading the engine. This causes the RPM to drop, and the vacuum pressure suffers. This in turns causes the lose of brake power. Increasing engine RPM, or adding a vacuum pump will solve this problem.
Does your unit have vacuum pump? Most likely not. And if you thought you got the 2014 model without the vacuum pump, then you've been short-changed.
The symptom usually means poor vacuum to the brake master pump. Could be caused by air leak. Need to find out problem first.
Installing vacuum pump is not a solution to the problem, but can solve it indirectly.
Here's a guide to troubleshooting:
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A) With the engine not running, press and depress the brake pedal several times to remove any vacuum from inside the brake system.
B) On the last push of the brake pedal, hold moderate pressure on the brake pedal. Donβt push like you are panic stopping, simply hold pressure like you are sitting at a red light.
C) Start the engine and pay attention to what happens to the brake pedal.
D) If the pedal drops slightly, then the booster\vacuum is working correctly.
E) If the pedal does not move at all, then there is a very good chance the booster\vacuum is bad.
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Thanks for the clear explanation , will try it out later
Quite dangerous to suddenly have no brakes