How to check the working pressure of the brake system of a car brake system

Follow these steps:

1 After adjusting the safety valve, stop the engine operation, slowly open the blowdown switch on the middle and rear wheel brake air cylinders, make the barometer indicate at 790 kPa, and slowly turn the pressure regulating screw of the pressure regulator valve to The pressure regulator purge valve opens and exhaust begins.

2 Reopen the blowdown switch on the brake cartridges in the middle and rear wheels to gradually reduce the air pressure in the air reservoir. When the air pressure drops to 720 kPa, the purge valve of the pressure regulator valve should be stopped and exhausted.

3 Fix the regulator screw with a screwdriver and lock it with the lock nut.

4 Restart the engine and continue to raise the air pressure. When the purge valve starts to exhaust, observe whether the air pressure indicated by the barometer is stable at 790 kPa. Otherwise, it should be adjusted again to meet the requirements.

Vacuum Forming Plastic

Vacuum-formed plastic is used to produce a variety of custom design parts.Vacuum forming become to be a popular and cost-effective solution for a wide range of plastic forming needs.


The product's application must be taken into consideration while selecting the material. Normal vacuum forming plastic included:Polyester, HDPE, LDPE, PVC,PETG,polypropylene, polystyrene, ABS, acrylics, polycarbonate, ASA as well as other ABS capped acrylic and ABS capped polycarbonate.


ABS plastic also named Acrylonitrile Butadiene Styrene,is the most widely used in vacuum forming and available in a range of textured, smooth and embossed finishes, offered in virgin, recycled,UV resistant and flame retardant grades(UL94-V0). As good impact resistance ABS usually is vacuum formed for vehicle,equipment,plastic tray and so on industrial.


HIPS plastic also named High Impact Polystyrene ,is most used in Point of Sale (POS), display and signage market due to its visual appearance (colour options, gloss level, texture), the ease with which it can be processed along with its antistatic and electrical conductivity.


HDPE plastic also named High-Density Polyethylene,is widely used in indoor and outdoor applications including bottles, playground equipment packaging and furniture. It is a plastic with high tensile strength, and good chemical and corrosion resistance.And it has properties of recycling,UV stabilised, improved impact resistance.


PP Plastic also named Polypropylene,is similar to PE. But PE is more harder more heat resistant.But PP is more durable.Mostly plastic tray is produced by PP plastic.


PMMA plastic also named acrylic or glass fiber.It has properties of tensile strength, transparency, polishability and UV tolerance but less impact strength.It is available in clear, antiglare, opal, white, and frosted.It is best choice for windows, displays or see-through enclosures.


PETG named Polyethylene Terephthalate Glycol is another clear rigid plastic sheet.PETG is easily vacuum formed, printed, bonded and polished. As its' excellent clarity and impact resistance, it is widely used in outdoor application.


PC named polycarbonate, has combined advantage of PMMA and ABS. Usually is transparency and semi- transparency. It is expensive but that is best choice for clear plastic vacuum forming.



ASA is one new material which has all good properties of ABS. But much good UV resistant for outdoor usage. It usually be used for radome,air conditioning housing etc outdoor products.



Meanwhile, ABS capped acylic combined the good properties of ABS and acylic. ABS capped polycarbonate combined the good properties of ABS and polycarbonate.If you need high glossy surface for your design,then this is your only choice.










Vacuum Forming Plastic,ABS Vacuum Forming,Polypropylene Vacuum Forming,HDPE Vacuum Forming,Polystyrene Vacuum Forming

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