sobrang lakas na brake

**bmacavanza** · January 15th, 2015 01:58 PM

Normally 1/2in ang brake pedal play

**red_one** · January 15th, 2015 03:41 PM

For comparison:

Mazda 6 Service Manual
Brake pedal free play = 0-3 mm (0-0.1 in)
Pedal-to-Floor clearance (With Pedal Depressed) = 68 mm (2.68 in)

Toyota Camry Service Manual
Brake pedal free play = 1-6 mm (0.04-0.24 in)
Pedal-to-Floor clearance (with Pedal Depressed) = 70 mm (2.76 in)

**sotel** · January 15th, 2015 09:24 PM

Originally Posted by LN106G

That is usually the problem if you did not replace the Hydrovac and the Brake Primary Master as a set. The push rod between the hydrovac & the Primary master is "mechanically engineered" as a set such that it has specific play during braking. You mix and mate a hydrovac with a Primary brake master not its partner (or vice versa) will usually result in sticking brakes, super sensitive brakes (just like yours), uneven braking. That's guaranteed. The only thing you can do for now is to adjust "lower" the push rod between the pedal and your hydrovAC. Do NOT touch/adjust the push rod between the hydrovac and primary master. That is why most shops in the US, emphasizes that these parts should be purchased with the right partner (Hydrovac and primary master), even if one of the 2 is old as long as you purchase its partner with the right parts serial #, it should be fine..

Set po na pinalitan sir yung master tsaka hydrovac

**jick.cejoco** · January 15th, 2015 09:57 PM

Aside from master cylinder and vacuum brake booster replacement, was there anything else replaced or done?

**sotel** · January 15th, 2015 10:09 PM

Originally Posted by jick.cejoco

Aside from master cylinder and vacuum brake booster replacement, was there anything else replaced or done?

wala na po sir

**miked** · January 16th, 2015 01:18 PM

Originally Posted by LN106G

That is usually the problem if you did not replace the Hydrovac and the Brake Primary Master as a set. The push rod between the hydrovac & the Primary master is "mechanically engineered" as a set such that it has specific play during braking. You mix and mate a hydrovac with a Primary brake master not its partner (or vice versa) will usually result in sticking brakes, super sensitive brakes (just like yours), uneven braking. That's guaranteed. The only thing you can do for now is to adjust "lower" the push rod between the pedal and your hydrovAC. Do NOT touch/adjust the push rod between the hydrovac and primary master. That is why most shops in the US, emphasizes that these parts should be purchased with the right partner (Hydrovac and primary master), even if one of the 2 is old as long as you purchase its partner with the right parts serial #, it should be fine..

oo..mas advisable talaga na palitan as a set or kung seal replacement lang e wag galawin ang pushrod. karamihan kasi ng mekaniko inaadjust yung pushrod under the dash. hindi nila alam na self adjusting naman halos lahat ng drum brakes (provided na operational ang parking brakes).

pero kung hindi as a set ang palit gaya ng ginawa ko e baka makatulong etong thread na eto: Brake Job DIY - PinoyHandyMan Do-It-Yourself Community

**sotel** · January 16th, 2015 02:28 PM

Originally Posted by miked

oo..mas advisable talaga na palitan as a set or kung seal replacement lang e wag galawin ang pushrod. karamihan kasi ng mekaniko inaadjust yung pushrod under the dash. hindi nila alam na self adjusting naman halos lahat ng drum brakes (provided na operational ang parking brakes).

pero kung hindi as a set ang palit gaya ng ginawa ko e baka makatulong etong thread na eto: Brake Job DIY - PinoyHandyMan Do-It-Yourself Community

set po na pinalitan sir yung hydrovac tsaka master

**jick.cejoco** · January 16th, 2015 04:09 PM

i think you have installed an overly sensitive brake booster or feather trigger booster. what was wrong with the old booster anyway? if the booster does not have vacuum leak nor damaged in any way, try reinstalling it. just make sure you have 1 mm clearance between the cavity of the primary piston and the push rod at fully seated position. there is a brake booster push rod measuring tool for this. but in its absence, you can try to extend the push rod out forward lightly, then, use the master cylinder to reseat it. move the master cylinder out of the way and with your finger, push the booster push rod in, it should move in or retract about 1 mm.

https://www.google.com/search?q=brak...ap%3B731%3B289

**LN106G** · January 16th, 2015 05:25 PM

or you did not bleed your brake system adequately. Did you bleed your primary master adequately before re installing the fittings for the front and rear brake lines? afterwards, did you bleed the 4 corners starting from the farthest wheel then lastly the nearest wheel to the primary master?

I prefer not to touch the push rod between the hydrovac and the primary master in any way. Once you touch this without the proper measuring tools, you mess up your brake system. guaranteed.

You can, however, adjust the pushrod between the brake pedal and the hydrovac....

**sotel** · January 16th, 2015 05:58 PM

Originally Posted by jick.cejoco

i think you have installed an overly sensitive brake booster or feather trigger booster. what was wrong with the old booster anyway? if the booster does not have vacuum leak nor damaged in any way, try reinstalling it. just make sure you have 1 mm clearance between the cavity of the primary piston and the push rod at fully seated position. there is a brake booster push rod measuring tool for this. but in its absence, you can try to extend the push rod out forward lightly, then, use the master cylinder to reseat it. move the master cylinder out of the way and with your finger, push the booster push rod in, it should move in or retract about 1 mm.

https://www.google.com/search?q=brak...ap%3B731%3B289

sira na po kasi yung master sir lagi po tumatagas kahit palit repair kit na yung hydrovac naman po dati na po palang sira yun nung binili yung van ko hehe..