Apparatus and method for removing and replacing vehicular hydraulic fluid while flushing the hydraulic system

• US 6,302,167 B1
• Filed: 01/13/2000
• Issued: 10/16/2001
• Est. Priority Date: 01/13/2000
• Status: Expired due to Fees

• Current Assignee: Environmental Brake Services Corporation
• Original Assignee: Environmental Brake Services Corporation
• Inventors: Hollub, Peter C.
• Primary Examiner(s): Douglas, Steven O.
• Application Number:
  US09/482,239
• Time in Patent Office: 642 Days
• Field of Search: 141/65, 141/98, 141/311.A, 141/86, 184/1.5
• US Class Current: 141/98
• CPC Class Codes: B60T 17/221 Procedure or apparatus for checking or keeping in a correct functioning condition of brake systems hydraulic pressure systems in general F15B19/00, F15B21/04; testing structures or apparatus G01M
• CPC Class Codes: F01M 11/0458 Lubricant filling and draining

Abstract

An apparatus and method for removing and flushing hydraulic fluid and contaminants from a vehicle'"'"'s or other equipment'"'"'s hydraulic system, and refilling the hydraulic system with new fluid. The apparatus has a vacuum pump to remove old hydraulic fluid from the master cylinder (reservoir) and a manifold and hose system to allow all bleeder valves and the ABS valves to be vacuumed at the same time through a hose system to a waste fluid container in the apparatus, a reversing vacuum pump to transfer waste fluid from the waste fluid container in the apparatus to an exterior storage tank, a reversing fill pump to pump new fluid from the new fluid container (in the apparatus) to the universal master cylinder adapter which connects the fill hose to the master cylinder, a combination of surging fill flow and surging vacuum out flow to produce a safe rapid removal of old fluid and refill of new fluid, a cross venting system to keep moisture and other contaminants from entering the new fluid container and to keep either the new fluid or the waste fluid container from venting fumes to the atmosphere. The apparatus also has sensors to detect and correct pressures and vacuum for safety and pump life. The apparatus also has a sensor to detect fluid levels in the waste fluid container in the apparatus, and a sensor to detect the availability of new fluid available for the service. The apparatus also provides a monitored leak containment area in the bottom of the apparatus to contain any leaks and advise the service provider of a leaking condition. The vacuum pump and vacuum wand can be used to clean out the containment area.

Claims

1. An apparatus for removing and replacing hydraulic fluid used in a hydraulic system, comprising:

a cabinet;

a leak containment tank under the cabinet to contain leaks from within the apparatus;

a computer control unit;

a new fluid container in said cabinet for providing a source of new fluid for use in flushing and filling the hydraulic system;

a waste fluid container in said cabinet for receiving waste fluid from the hydraulic system;

a reversible fill pump in fluid communication with the new fluid container and controlled by the computer control unit for dispensing new fluid from the new fluid container to the hydraulic system through a fill hose to be connected to the hydraulic system;

a reversible vacuum pump in fluid communication with the waste fluid container and controlled by the computer control unit for vacuuming waste fluid from the hydraulic system to said waste fluid container through one or more bleeder valve hoses to be connected to the hydraulic system and said waste fluid container;

a connection means at an end of each of said one or more bleeder valve hoses;

a connection means at the end of said fill hose; and

,

a vacuum wand connected with a first end of a vacuum hose, the reversible vacuum pump in fluid communication with the other end of the vacuum hose for vacuuming fluid through the vacuum wand.

2. The apparatus according to claim 1, further comprising a universal master cylinder adapter for removeably connecting said fill hose to an opening of the hydraulic system, wherein the universal master cylinder adapter includes a seal for sealing the opening.

3. The apparatus according to claim 2 wherein said universal master cylinder adapter fills a portion of the opening when the seal seals the opening.

4. The apparatus and method according to claim 2 wherein said universal master cylinder adapter includes a round protrusion to allow fitting the universal master cylinder adapter to the opening.

5. The apparatus according to claim 1, further comprising a universal master cylinder adapter for removeably connecting said fill hose to a two section opening of the hydraulic system, wherein said universal master cylinder adapter allows stopping the flow of new fluid from the fill hose to one of the two sections of the opening.

6. The apparatus according to claim 1 wherein said one or more bleeder valve hoses each include a check valve to prevent flow out of each of the one or more bleeder hoses.

7. The apparatus according to claim 1 wherein a trigger grip of the vacuum wand controls the vacuum at the vacuum wand.

8. The apparatus according to claim 1 wherein a vacuum solenoid valve isolates said reversible vacuum pump from the one or more bleeder hoses when the vacuum solenoid valve is closed, the computer control unit being configured to control the vacuum solenoid valve.

9. The apparatus according to claim 1 further comprising a liquid sensor connected with the fill hose for the computer control unit to sense the presence of liquid in the fill hose.

10. The apparatus according to claim 9 further comprising, a pressure transducer in fluid communication with the fill hose for the computer control unit to sense the pressure in the fill hose.

11. The apparatus and method according to claim 9 wherein said computer control unit is configured to control the reversible fill pump to create a controlled surging flow of new brake fluid into the hydraulic system.

12. The apparatus and method according to claim 9 wherein said computer control unit is configure to reverse the reversible fill pump to eliminate pressure in the fill hose.

13. The apparatus according to claim 1, further comprising a liquid sensor in the containment tank for the computer control unit to sense liquid in the containment tank.

14. The apparatus according to claim 13 wherein said computer control unit is configured to advise the service provider of a leak when the liquid sensor senses liquid in the containment tank.

15. The apparatus according to claim 1, further comprising a cross vent containing a hydraulic fluid fume removing desiccant that allows the new fluid container and waste fluid container to communicate through the desiccant.

16. The apparatus according to claim 15 wherein said cross vent allows air to vent from the waste fluid container.

17. A method of using an apparatus for removing hydraulic fluid from a hydraulic brake system, comprising the steps of:

a. removing a cap from an opening of a master cylinder of the hydraulic system;

b. activating a vacuum pump and using a controllable vacuum wand to vacuum out said reservoir to a waste fluid container;

c. selecting and attaching a master cylinder adapter to the opening;

d. activating a fill pump to fill the master cylinder with new fluid until a preselected pressure is achieved in the master cylinder;

e. attaching a bleeder valve hose to a bleeder valve of the hydraulic system;

f. activating a solenoid valve which opens a vacuum line to the bleeder hoses;

activating a vacuum pump to vacuum waste brake fluid from the bleeder valves via the bleeder valve hoses and vacuum line and to supply vacuum to the vacuum wand;

h. at the same time as i. activating the fill pump to supply pressure at the master cylinder to cause waste fluid to flow out of the hydraulic system and new brake fluid to flow into the hydraulic system;

i. closing the bleeder valves when the fluid flowing out of the hydraulic system through the bleeder hose is clear;

j. stopping the vacuum pump and then the fill pump;

k. reversing the fill pump for 3 to 5 seconds to remove pressure in the master cylinder,

l. removing the master cylinder adapter from the opening;

m. replacing the master cylinder cap;

n. checking a pedal of the hydraulic system for firmness.

18. The method according to claim 17 wherein said vacuum pump is reversed to flow waste fluid from a waste fluid container through the vacuum wand.

19. The method according to claim 17 wherein said vacuum wand is used to vacuum fluid in a containment area.

20. An apparatus for servicing a hydraulic system, the hydraulic system including a master cylinder having an opening and a cap over the opening, the hydraulic system also having one or more bleeder valves in fluid communication with the reservoir, comprising:

a new fluid tank;

a fill pump in fluid communication with the new fluid tank;

a master cylinder adapter in fluid communication with the fill pump and having a seal to seal the opening of the master cylinder, the fill pump to supply fluid from the new fluid tank to the master cylinder;

one or more bleeder valve hoses, each bleeder valve hose of the one or more bleeder valve hoses to be connected to a bleeder valve of the one or more bleeder valves; and

,

a waste fluid tank in fluid communication with the one or more bleeder valve hoses.

21. The apparatus of claim 20, further comprising:

a vacuum pump in fluid communication with the one or more bleeder valves and the waste fluid tank to vacuum waste fluid from the one or more bleeder valves.

22. The apparatus of claim 21, wherein the vacuum pump is a reversible vacuum pump.

23. The apparatus of claim 21, further comprising a vacuum wand in fluid communication with the vacuum pump, the vacuum pump to vacuum fluid from the vacuum wand.

24. The apparatus of claim 23, wherein the vacuum wand includes a trigger grip to control the vacuum wand.

25. The apparatus of claim 21, wherein the waste fluid tank is in fluid communication with the ambient air through the desiccant.

26. The apparatus of claim 20 wherein the fill pump further comprises a reversible fill pump.

27. The apparatus of claim 20, further comprising:

a cross vent containing a desiccant, the new fluid tank and the waste fluid tank in fluid communication through the desiccant.

28. The apparatus of claim 20, wherein each of the one or more bleeder valve hoses is coupled to a check valve to prevent back flow from the each of the one or more bleeder valve hoses.

29. The apparatus of claim 20, wherein the seal fills a portion of the master cylinder when the master cylinder adapter is sealed to the master cylinder.

30. The apparatus of claim 20, wherein the seal has a fluid groove in fluid communication with the fill hose, the groove being positioned to allow flow into one or more segments of the master cylinder when the master cylinder adapter is sealed to the master cylinder.

31. The method of claim 20, further comprising:

a pressure transducer in fluid communication with the fill hose.

32. The method of claim 20, further comprising:

a liquid sensor connected to the fill hose.

33. A method of servicing a hydraulic system, the hydraulic system including a master cylinder having an opening and a cap over the opening, the hydraulic system also having one or more bleeder valves in fluid communication with the reservoir, comprising:

sealing a master cylinder adapter to the opening of the master cylinder;

opening a bleeder valve of the one or more bleeder valves;

flowing fluid from the master cylinder adapter to the master cylinder;

pressurizing the master cylinder with fluid from the master cylinder adapter; and

,

closing the bleeder valve.

34. The method of claim 33, wherein the flowing fluid further comprises flowing fluid to a plurality of sections of the master cylinder.

35. The method of claim 33, further comprising:

causing the flow of fluid from the master cylinder adapter to the master cylinder to surge.

36. The method of claim 33, further comprising:

filling a volume of the master cylinder with the master cylinder adapter.

37. The method of claim 33, further comprising:

placing a protrusion of the master cylinder adapter in the master cylinder.

38. The method of claim 33, further comprising:

depressurizing the master cylinder after the sealing the sealing a master cylinder adapter to the opening of the master cylinder.

39. The method of claim 33, further comprising:

vacuuming waste fluid from a bleeder valve of the one or more bleeder valves.

40. The method of claim 39, wherein the vacuuming further comprises vacuuming the waste fluid to a waste fluid tank.

41. The method of claim 40, further comprising venting the waste fluid tank through a desiccant.

42. The method of claim 33, further comprising:

determining that the master cylinder is full by sensing a pressure in fluid communication with the master cylinder adapter.