Does it bleed air from the ABS module as well

There are two types of ABS modules. An OPEN and CLOSED type system. An OPEN system will allow you to bleed the brake system and ABS module as normal since it's an OPEN sytem and the fluid flushes right through. A CLOSED system on the other hand requires a separate bleeding procedure in order to open up the internal solenoid valves to allow the brake fluid to flush through. This process is more involved and requires additional tooling or procedures to accomplish. See vehicle manufacturers service manual for instructions. Ok so now you want to know if you have an OPEN or CLOSED ABS module. Best way to find out is go to your vehicles manufacturer service manual and see what the final steps are after replacing a brake caliper, master cylinder, ABS module or any brake system component that you need to open up the system. At the end of any procedure I mentioned it will tell you to bleed the brake system. If no mention of a special procedure to bleed the ABS module separately then it's safe to say you have an OPEN system. Most newer vehicles today have an open system for ease of bleeding and flushing. I believe early ABS systems were a CLOSED system but I'm sure there are some late model vehicles that still have a CLOSED system. Ok, that's the short version. Hope this helps.

What is the typical pressure used to pressurize the master cylinder? 10psi? 20psi?

We use 10psi . We have also used 20 but I personally found no difference. The unit does produce alot bubbles in the pressure line line so we use 10 psi to minimize the bubbles.

you need an air compressor....if memory serves the compressor needs to be 5SCFM minimum but check the Mityvac website. You attached the mityvac to each bleed nipple in turn and just open the nipple enough to start fluid being extracted into the Mityvac. It worked well for me, I'd tried other methods of purging the lines but this worked best.

does anyone know how to use the mva801 adapter? its just a cap with no fittings

It is used on dual cap master cylinders. You use that to cap off the other side of the mastercylinder. Factory mastercylidee caps do not hold, not are they meant to, pressure. Therefore if you just left the factory cap on the brake fluid would fill the reservoir and start leaking out

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⚙️ Elevate your brake game—bleed like a pro, every time!

DURABLE PORTABLE DESIGN - Heavy-duty case for organized storage and easy transport—perfect for pros on the move.
SAFE PRECISE PRESSURE CONTROL - Integrated pressure relief valve ensures consistent, hands-free operation.
VERSATILE PRO GRADE PERFORMANCE - Engineered for hydraulic brake and clutch systems across all vehicle types.
MAXIMIZE EFFICIENCY WITH 1 2 GALLON RESERVOIR - High-capacity fluid service for uninterrupted brake and clutch maintenance.
UNIVERSAL FIT WITH 7 MASTER CYLINDER ADAPTERS - Seamlessly connect to cars, motorcycles, ATVs, and trucks without hassle.

The Mityvac MV6840 is a professional-grade hydraulic brake and clutch pressure bleeding system featuring a 1.2-gallon reservoir, seven master cylinder adapters for broad vehicle compatibility, and an integrated pressure relief valve for safe, hands-free operation. Packaged in a durable carrying case, it’s designed for efficient, precise brake fluid service across cars, motorcycles, ATVs, and trucks.

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Manufacturer	Lincoln
Brand	Mityvac
Model	MV6840
Product Dimensions	40.64 x 30.48 x 30.48 cm; 5.17 kg
Item model number	MV6840
Manufacturer part number	MV6840
Item Weight	5.17 kg

Mityvac MV6840 Hydraulic Brake and Clutch Pressure Bleeding System with Integrated Safety and Pressure Relief Valve, 7 Master Cylinder Adapters and Case, Black, 12 x 12 Inch

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