Index

Overview

Tuning

Tuning Overview

Lighter Roller Weights

Remove Variator Restrictor

Stiffer Clutch Springs

Move Needle Jet Washer

Increase Fuel Jet Size

Carb De-restriction

Un-Restricted CDI Unit

Un-Restricted Air Inlet

Trouble Shooting

Compression Test

Fuel Enricher Test

Seized Brake Caliper

General Maintenance

Replace Air Filter

Check & Change Oil

Spark Plug Change

Idle Speed Adjust

Change Brake Pads

Adjust Valve Lash

Electrical

Testing the Battery & Charging System

Battery Change

Coil Change

HT Lead Change

Transmission

Remove Starter Motor

Refurb Bendix Gear

Engine

Camshaft Removal

Valve Removal

Replace Valve Guides

Engine Removal



Return to Transport Listings

Models Covered

Lexmoto, Pulse, Sukida, Baotion, Lifan, Direct Bikes, Huatian, JMStar, QT50, LF50QT, YH50QT, BT49qt, 139 QMB, Honda, GY6, Motorbike, Taishan, Jonway, Peugeot V-Clic, QT-4, QT-7, QT-9, qt-11, QT-50 Kymco, Tank, Quinqzi, PGO, Roketa, Strada, Vento, Yamati, QMB139, SunL, SYM, QingQi, Volano Plus Many More Chinese Motorcycles, mopeds and scooters!



Brake Caliper

As on all modern 50c and 49cc twist and go scooters and motorbikes, chinese imported honda style clones use a front disk brake system for the best braking performance. The front disk brakes rely on a hydraulic caliper to apply force to the disk when the brake lever is pulled on. The brake calipers vary in size depending on the size and power of the motorcycle, but most QMB139 50cc scooter clones use the same basic brake caliper.

How to Overhaul a 50cc Scooter Front Brake Caliper

Applies to: Baotian, Sukida, Hoatian, Lifan, JMStar, Jinlun, Kymco, Tank, Quinqzi, PGO, Roketa, Strada and Taishan QingQi Direct Bikes, Starway, JMStar and many more...

Overhauling the Front Brake Caliper

If your imported 50c chinese scooter has been standing unused for a time, or the front brakes have been exposed to alot of weather, the front brake caliper may benefit from a basic overhaul. It is basically a case of removing, cleaning and lubricating the brake caliper so it functions efficiently. Ideally, you would use an impact wrench to undo the nut. You will require a few basic tools, cleaning and lubricating equipment and some patience.

If your your chinese scooter is suffering from poor braking performance, or the brakes are sticking on then follow these steps to clean and overhaul the from caliper.


  1. Picture of a 50cc 4 stroke scooters seized Caliper.

    Seized Front Caliper on a GY6 Chinese Scooter 4 Stroke
  2. Undo the two bolts that secure the front brake caliper to your 50cc scooters front forks and slide the brake caliper away from the disk.

    Undo the bolts securing Caliper to Honda Clone Chinese Motorbike
  3. Now, undo and remove the slide bolt that help secure the two halves of the caliper together. This will allow you to separate the two parts of your QMB139 50cc scooters caliper ready for cleaning. NOTE: If your motorbikes caliper is heavily corroded and seized you may have to apply penetrating oil and gently separate the parts!

    Separating the Brake Caliper on your GY6 Chinese 50cc Scooter Clone
  4. Now separate all the parts on your chinese 50cc scooters brake caliper and clean and lubricate thoroughly using a wire brush, carb cleaner and spray grease. Use large pliers or similar to compress the calipers piston in and out of the caliper.

    Disassemble the 139QMB front Brake Caliper
  5. Reassemble your chinese import scooters front brake caliper, apply grease to any sliding parts, replace the brake pads if necessary. Do not get grease on you motorbikes front brake pads!










Notes

On reassembly, ensure to lubricate the sliding parts of your chinese scooters front brake caliper. If the caliper was seized this may prevent it seizing again in the future.

The descriptions given on this page are not really a true caliper overhaul, more a lubricating and cleaning guide. Once your chinese import 50cc honda clone motorbike scooters front brake calipers have seized once, they will require regular cleaning and lubrication to prevent the brakes from seizing again.



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