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FUNCTION OVER FORM
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Steps for bleeding GenCoupe brakes or any production based vehicle with single master cylinder
retrieved from MBS & here's the link: Brake System Bleeding

Supplies needed:
- 2 people
- Supply of high quality brake fluid from an unopened container
- Bleed bottle (I used suction from flush machine)
- 10mm hex box end or line wrench for bleed screws on calipers (2 per caliper)

With the car on jack stands and a person sitting in the driver seat:
(There are enough threads on jacking & supporting a car with jack stands etc..)
- Place the wrench over the bleed screw on the caliper furthest from the driver
- Place the bleed hose attached to the bleed bottle over the bleed nipple with the wrench. If the caliper has two bleed screws, start at the inboard bleeder first (ours do)
- Open the bleeder
- With the bleed screw open, have the "driver" slowly depress the brake pedal to the floor. With the driver holding the pedal down, gently close the bleed screw.With the bleeder closed, the driver can release the brake pedal
- Repeat this process until the fluid coming from the caliper is clear and free of air bubbles
- For calipers with 2 bleeders, repeat this process for the outboard bleeder
- Monitor the fluid level in the reservoir and refill as necessary during the process
- When finished torque bleeders to factory recommended settings

Repeat these steps for each caliper, working towards the caliper closest to the driver. At times it is helpful to tap the caliper body with a soft mallet to release any small air bubbles trapped inside the caliper. At this point, the brake pedal should be checked for firmness and consistency. If the fluid is free of air bubbles and the pedal is still soft or spongy, there may be further issues that need to be addressed with the brake system. When finished, fill the fluid reservoir to the "full" line, but not over.
 

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Premium Member
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294 Posts
Hey Tufast,

Have you ever bled the master cylinder? Where's the valve to do so?
 

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hey, I read something interesting the other day on brake bleeding. It said place a small 1x4 in. block under the brake pedal to keep from pushing the pedal completely to the floor I am guessing this is to keep the master cylinder in its operating range if there is any corrosion roughness on the piston/slide which could nick the "o" rings and cause a bypass leak [which actually happened to me years ago and took forever to figure out what messed up my simple bleed job.
 

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The service manual says to use a scantool to command the ABS system into Air Bleeder Mode before bleeding the system. Without that it can damage the ABS motor.
 

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I'm confused... found 2 different methods in service manual for bleeding air from brake system. One uses the scantool, the other does not. Red Raspberry pointed out that the scantool method is needed only if replacing the ABS pump.

In the non-scan-tool method I do see that the order for bleeding is:
1. Rear passenger
2. Front driver
3. rear driver
4. Front passenger

I wonder why the order isn't start from the furthest caliper and work your way towards the BMC?
 

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YUP ITS A HYUNDAI
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138 Posts
anyone know how much fluid we need? 1L?
 

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0.7 to 0.8 qt according to the owners manual for the older models. Probably similar for yours as well. I use the Valvoline synthetic brake fluid, which I have seen recommended on here for my car which is used as a daily driver. I usually grab a 1 qt bottle and an extra 12 oz bottle just in case. The 1 qt bottle should be enough, so I just return the smaller one if I don't use it.

I make my own bleeder bottle with plastic sports drink bottle, 3.8" OD (1/4" ID) vinyl tubing, and zip tie. You'll need a drill of course to put holes in the cap.
 
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