Pocketbike Forum banner

1 - 10 of 10 Posts

·
Registered
Joined
·
84 Posts
Discussion Starter · #1 ·
Put new pads on but now can't get the caliper back on the front and how do I bleed the brakes ? Thanks
 

·
Banned
Joined
·
24,145 Posts
Push the pads back in if there hydraulic.
 

·
Registered
Joined
·
84 Posts
Discussion Starter · #3 ·
I got the brake caliper on now.but came to the decision that the caliper is seized up .i bleed the brakes and they don't get tighter .I did it several times .Thanks for the feedback .
 

·
Banned
Joined
·
21,742 Posts
You need to reset the caliper pistons back into the caliper...Put the old pads back in and force the pistons back by prying between the old pads with a screwdriver...

Theres a way to mod the stock brake caliper to apply more pressure to the pistons to make the brakes work way better.Theres a vid on utube on how made by a member from here...............Good Luck
 

·
Registered
Joined
·
89 Posts
If I may:

Hydraulic brakes work like any other hydraulics. The fluid being pushed in enters via a very small hole in comparison to the vessel it is filling. This multiplies the force and gives you enormous clamping power.

In contrast, it also makes them a devil at times to compress your calipers so that new pads will fit.

The pistons should be fully collapsed down into the caliper bores before you stick on new pads. This will make the installation much easier. With a car its often done with a caliper compressor. A simple tool.

With something like these little bikes, a C clamp can probably be made to work. If its a single piston, it'll go easy. If it's a dual then it may want to push the opposite side out as you compress the one. (same circuit, path of least resistance)

Hope this helps.

C.
 

·
Banned
Joined
·
21,742 Posts
If I may:

Hydraulic brakes work like any other hydraulics. The fluid being pushed in enters via a very small hole in comparison to the vessel it is filling. This multiplies the force and gives you enormous clamping power.

In contrast, it also makes them a devil at times to compress your calipers so that new pads will fit.

The pistons should be fully collapsed down into the caliper bores before you stick on new pads. This will make the installation much easier. With a car its often done with a caliper compressor. A simple tool.

With something like these little bikes, a C clamp can probably be made to work. If its a single piston, it'll go easy. If it's a dual then it may want to push the opposite side out as you compress the one. (same circuit, path of least resistance)

Hope this helps.

C.
The pistons are the size of a quarter,nickel or a dime and about 8-12mm thick..Some calipers have one,two and four pistons....a tool isnt necessary with these chinese crap bikes...I can remove the pistons with a screwdriver or o-ring pliers and reinstall them with my thumb after I mod them with my Dremel............even installed and full of fluid they arent very hard to compress...

The chinese put a flat piston bottom to a flat caliper reservoir with no room for fluid when the pistons are pushed in all the way to properly function...The pusher hole is located on the side of the piston instead of behind....A spacer channel needs to be dremeled in behind the piston in the caliper casting from the misplaced side located fluid hole the chinese manufactured and the hole needs to be dremele shaped lower so the fluid can press the pistons out and apply brake pressure to the brakepads correctly..............Good Luck
 

·
Banned
Joined
·
24,145 Posts
Since where talking about brakes. On all 9 of my bikes the metal brake disc on the wheels with slots & holes have been filed or sanded. There edges are sharp and scrape material off you pads everytime you hit the brakes, front or rear. Mine last alot longer now that all the edges are smooth.
 

·
Registered
Joined
·
14 Posts
Sorry for bumping an old thread, But can someone tell me where I can find pads for my x7 49cc ?? Both of my brakes are legit gone, nothing, nada!! Thanks and I appreciate it!!!!!
 

·
Banned
Joined
·
24,145 Posts
At pocket bike parts your can get a front & rear set of hydraulic brakes set, w/ handle/master to the calipers with shoes. $25 for the front $30 for the rear. Here's a set on my X7 front forks. Much better than the stock brakes.
 

Attachments

1 - 10 of 10 Posts
Top