Quote Originally Posted by dr. d View Post
older hydraulic brakes were all drums. disc brakes came later. and with the disc brakes came the hydrovac. and as many of us found out during a brief but harrowing segment of our life, if the hydrovac loses its vacuum, even standing and jumping on the brake pedal won't give the disc brakes any appreciable bite.
i suspect the guy's jeep is all drums, hence the lack of a hydrovac. he can try and get a hydrovac-master cylinder assembly and connect it to his current brake lines and see if it works well, although i do not remember seeing a four-drum brake vehicle with a hydrovac.. but i could be wrong. otherwise, he might just have to source disc brakes for his front wheels...

why pump the brake pedal more than once to get a half-decent brake force? i am guessing that the master cylinder and the wheel slave cylinders do not match. or may hangin.. typical of jeepney assemblers.. heh heh.

and i am sure a 4k engine has hydrovac. i used to drive a corolla liftback. 4k engine, hydrovac, discs in front and drums out back... handsome car.. sino na kaya ang nag-da-drive noon? someone from pasig, i think..

and, oh yes... the hydrovac should always match the master brake cylinder. otherwise, the brakes won't work smoothly, if at all.
they pump it because the brake pads are not close enough to the drum, 2 consecutive half pump then final step will fill the slave cylinders with brake fluid and will make the pads closer to the drum